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A systematic review of mobile health technologies to support self-management of concurrent diabetes and hypertension

A systematic review of mobile health technologies to support self-management of concurrent... Abstract Objective This article reports results from a systematic literature review of the current state of mobile health (mHealth) technologies that have the potential to support self-management for people with diabetes and hypertension. The review aims to (a) characterize mHealth technologies used or described in the mHealth literature and (b) summarize their effects on self-management for people with diabetes and hypertension from the clinical and technical standpoints. Materials and Methods A systematic literature review was conducted following PRISMA guidelines. Online databases were searched in September 2018 to identify eligible studies for review that had been published since 2007, the start of the smartphone era. Data were extracted from included studies based on the PICOS framework. Results Of the 11 studies included for in-depth review, 5 were clinical research examining patient health outcomes and 6 were technology-focused studies examining users’ experiences with mHealth technologies under development. The most frequently used mHealth technology features involved self-management support (n = 11) followed by decision support (n = 6) and shared decision-making (n = 6). Most clinical studies reported benefits associated with mHealth interventions. These included reported improvements in objectively measured patient health outcomes (n = 3) and perceptual or behavioral outcomes (n = 4). Discussion Although most studies reported promising results in terms of the effects of mHealth interventions on patient health outcomes and experience, the strength of evidence was limited by the study designs. Conclusion More randomized clinical trials are needed to examine the promise and limitations of mHealth technologies as assistive tools to facilitate the self-management of highly prevalent comorbidity of chronic conditions, such as diabetes and hypertension. mobile health, mHealth, multiple chronic conditions, diabetes mellitus, hypertension INTRODUCTION Chronic diseases such as heart disease, cancer, and diabetes are permanent, leave residual disability, and require long periods of supervision, observation, and care.1,2 About 42% of the overall population of American adults and 81% of those 65 years old or older had 2 or more concurrent chronic conditions (ie, multiple chronic conditions [MCC]) as of 2014.3 Among prevalent chronic diseases, diabetes and hypertension often develop together because they are highly related pathogenetically.4 In 2015, two-thirds of diabetic patients had hypertension5 and 33.1% of all Medicaid and Medicare beneficiaries had both conditions.6 The negative synergy of this dyad precipitates significant microvascular (eg, kidney diseases) and macrovascular (eg, myocardial infarction, stroke) complications that may result in the need for dialysis or limb amputation.5,7 Research evidence shows that people with MCC, such as those with diabetes and hypertension, use more health services (eg, emergency and clinic visits, hospitalization, prescriptions), have more medical expenditures, and experience greater difficulties with activities of daily living (eg, bathing, dressing, eating) and other social and cognitive functions (eg, participating in social or family activities) compared to those with a single condition.3,8 Mobile health (mHealth) technology is defined as wireless devices and sensors intended to be worn, carried, or accessed by patients or health care providers for monitoring health status or improving health outcomes.9 Given the increased penetration rate of smartphones—81% of American adults owned a smartphone as of 2019,10 which is a dramatic increase from 35% in 201111—advanced mHealth technologies implemented in smartphones such as Bluetooth, motion-detecting sensors (eg, accelerometer, gyroscope), global positioning system (GPS), and software applications (apps) have great potential to deliver health care services customized for individuals in terms of timing, location, and needs. In the marketplace, more than 318 000 mHealth apps are available for download,12 many of which have been developed for patients with prevalent chronic conditions, such as diabetes and hypertension.13 In the Google Play Store, for example, 241 apps for diabetes and 208 apps for hypertension were identified as of 2019.14 Although the efficacy of mHealth interventions reported in the literature has been inconclusive, many studies have reported promising results of mHealth interventions in improving patient outcomes such as body measures (eg, weight, waist circumference), metabolic and physiological measures (eg, blood pressure, glucose), adherence to and safe use of medications, physical activity, diet management, and awareness of health conditions and treatment options.15–17 Previous reviews, however, focused mainly on mHealth interventions for a single condition (eg, diabetes, weight loss, asthma)18–20 or dealt with a group of diseases individually (eg, respiratory disease, diabetes, hypertension),13,17 not MCC. To address this gap in the literature, we systematically reviewed articles that used or developed mHealth technologies, or both, as an assistive tool to support self-management of MCC with a focus on diabetes and hypertension. In particular, we included both clinical studies that examined the effect of mHealth technology on patient outcomes (eg, biomarkers, perceptions, behaviors) and nonclinical user studies focusing on the development and testing of mHealth technologies for diabetes and hypertension. The included articles, therefore, used different study designs such as randomized trials, cohort studies, and case reports that used or developed (or both) mHealth technologies for patients with both diabetes and hypertension. The goal of this systematic review is to advance our understanding of currently available mHealth technologies for diabetes and hypertension and the potential and limitations of mHealth interventions to improve various aspects of patient outcomes. To our knowledge, this is the first systematic review of the efficacy of mHealth interventions targeting diabetes and hypertension. MATERIALS AND METHODS Literature search strategy and screening process We developed a study protocol in compliance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines.21 Eligibility criteria for publications were (a) original research articles published in peer-reviewed journals or conference proceedings; (b) reported findings from a study that developed or used (or both) mHealth technology to support patients’ self-management of both diabetes and hypertension; (c) written in English; and (d) published in or after 2007, the year when the first smartphone (the iPhone) was introduced, after which mHealth apps could be developed. We excluded articles that (a) only focused on 1 condition, (b) broadly discussed chronic conditions without focusing on both diabetes and hypertension, or (c) covered both diseases yet ignored mHealth technology as an assistive tool in the interventions. Based on Medical Subject Headings22 and literature browsing, we identified 2 groups of search terms to retrieve an exhaustive collection of relevant articles meeting the eligibility criteria: (a) disease-related terms (eg, diabetes, diabetics, hypertension, high blood pressure) and (b) mHealth technology-related terms (eg, mobile health application, mHealth, smartphone). We searched 5 electronic databases (PubMed, Web of Science, ScienceDirect, Association for Computing Machinery Digital Library, and Institute of Electrical and Electronics Engineering Xplore Digital Library) and scanned reference lists of articles (for more details on search queries and results by database, see Supplementary Material). The last search was run on September 17, 2018. Two members of the review team (which included all authors of this paper), screened the titles and abstracts of the retrieved articles to evaluate their relevance to the present review. When an article’s relevance could not be determined by its title and abstract, the full text was reviewed by the 2 reviewers. Data collection and analysis Overall, relevant articles were recorded on a data extraction form based on the PICOS criteria. Specifically, the participant (P) criterion focused on describing the characteristics of the participants in each study (eg, target audience, age); the intervention (I) criterion involved analyzing the procedure of clinical interventions and the types of mHealth technology features used in the studies; the comparator (C) criterion focused on identifying the subgroups of participants that were compared to evaluate the effects of interventions in each study (eg, same group before and after a given intervention, similar groups with and without intervention); the outcome (O) criterion analyzed the effects of the interventions on self-management and treatment of diabetes and hypertension; and the study design (S) criterion described the methodological characteristics of the studies. A risk-of-bias assessment was completed for the clinical studies (n = 5), consisting of randomized controlled trials (RCTs), pre–post evaluation studies, and cohort studies using the Cochrane Collaboration’s tool for assessing risk of bias.23 Review Manager 5.324 was used to record and generate a risk-of-bias graph. The mHealth technology features implemented in the included studies were categorized into 3 groups based on an existing design framework for mHealth apps targeting chronic conditions:25 (a) a self-management module enabling patients to record their biomarkers (eg, blood pressure, glucose) and other helpful activities (eg, diet management, physical activities, medication adherence) and receive credible information about their health conditions (eg, symptoms, treatment options); (b) a decision support module helping patients assess their progress and current status regarding self-management and detect abnormal or urgent situations requiring their providers’ special attention (eg, feedback on readings, alerting system); and (c) a shared decision-making module allowing patients to share their data with clinicians and choose optimal treatment options together (eg, data repository and transmission, connection with electronic health report systems, summary reports on trends of patients’ conditions and self-management activities over time). Two reviewers (WC, SW) analyzed included articles to identify relevant information for the PICOS criteria. The other 3 authors addressed a subset of the criteria based on their expertise: One (YL) focused on analyzing the characteristics of the participants and design of the included studies; the second (HO) analyzed the clinical aspects of the interventions and associated outcomes; and the third (ZZ) focused on the technical specifications of the mHealth technologies and associated outcomes. An online spreadsheet was shared among all authors to store information extracted from eligible publications. Disagreements were resolved by discussion among the relevant review authors (a subset or all of the authors). RESULTS Our search yielded 657 publications. After removing duplicates, 366 unique publications were identified. Of the 366 publications whose titles and abstracts were reviewed, 12 were identified as eligible for full-text review. Two additional publications meeting the eligibility criteria were identified from the references of the 12 full-text publications reviewed. Of the 14 publications, 4 were excluded due to not meeting the following criteria: One did not involve both diabetes and hypertension; 2 other studies did not involve the patient–mHealth technology interaction; and the last was not an original research paper—it was a review paper. Of the 10 eligible publications, 1 reported 2 distinct studies (phases I and II; see Logan, 2007, in the online Supplementary Material), resulting in 11 studies to be analyzed (see Figure 1 for the PRISMA flow diagram describing the overall search and selection process). Overall, 5 of the 11 included studies (45.5%) were clinical intervention studies focused mainly on examining the effects of mHealth technologies on health outcomes,26–30 whereas the remaining 6 studies (54.5%) were user studies focused on the development and usability testing of mHealth technology under investigation.31–36 We included both clinical and nonclinical types to understand the overall scope of mHealth-based studies in this field. More specifically, we aimed to survey currently available mHealth technologies used to deliver interventions to the target audience in clinical studies and technologies under development. Figure 1. Open in new tabDownload slide PRISMA flow diagram indicating results of identification and screening process for included and excluded papers. Figure 1. Open in new tabDownload slide PRISMA flow diagram indicating results of identification and screening process for included and excluded papers. Characteristics of included studies Of the 11 included studies, 7 (63.6%)26–28,31,33,34,36 were published in or after 2012; the remaining 4 (36.4%)29,30,32,35 were published between 2007 and 2009. The majority of the studies were conducted in North America (n = 8; 72.7%),26–28,30–32,34,36 followed by Asia (n = 1; 9.1%)33 and Europe (n = 1; 9.1%);29 1 report (n = 1; 9.1%)35 did not specify the location of the study. Eight of the 11 studies (72.7%)26–28,30,32–34,36 were published in peer-reviewed journals and 3 (27.3%)29,31,35 were published in peer-reviewed conference proceedings (report characteristics are summarized in the online Supplementary Material). Five studies (45.5%)30,32,34–36 had a sample size smaller than 50; 2 (18.2%)28,33 had a sample of 50–100; and 4 (36.4%)26,27,29,31 had a sample size larger than 100. The ages of the participants ranged from 45 to 70 years old. Two (18.2%)28,30 used a pre–post study design; 2 (18.2%)27,29 were RCTs; 1 (9.1%)26 was a retrospective cohort study; 5 (45.5%)31,33–36 were usability studies; and 1 (9.1%)32 focused on gathering users’ requirements for the app under development. In terms of interventions, 3 studies (27.3%)27,29,30 asked patients to take biomarkers (eg, blood pressure, glucose) by themselves on a regular basis and 2 (18.2%)26,28 delivered educational interventions to patients using mHealth technology. The 6 technology-focused user studies (50%)31–36 did not involve an intervention. The duration of the interventions implemented in the clinical studies ranged from 3 to 20 months (study characteristics are summarized in the Supplementary Material). mHealth technologies for self-management interventions targeting diabetes and hypertension In terms of technology types used, 3 studies (27.3%)31,35,36 used mHealth apps designed for mobile devices, especially smartphones; 4 (36.4%)26,27,29,34 used generic mobile phone functions such as calling, texting, or reading a QR code; 5 (45.5%)28,29,31,34,36 used web interfaces for visualization and sharing of patient data with providers; and 5 (45.5%)27,29,30,32,35 incorporated Bluetooth-enabled devices for reading biomarkers, such as blood pressure and glucose. Features supporting patients’ self-management All of the 11 studies (100%)26–36 used self–management-related features as follows. A reminder feature helped patients adhere to prescribed medications and encouraged them to enter data into the system. A data entry feature allowed users to log different types of data such as medical indicators (eg, blood pressure, glucose), diet (eg, nutrition information, calories), and physical activities (type and duration of exercise). A feedback feature generated feedback messages to inform users about their progress in the self-management of their chronic conditions. An education feature provided educational content to improve patients’ understanding of their conditions, in general, and address potential questions patients might have regarding the medications they were taking, new symptoms they had, and how to manage them. Features supporting clinical decision Six (54.5%) studies29–32,34,36 used clinical decision support features, such as an assessment feature that interpreted readings based on guidelines and thresholds for important biomarkers, such as blood pressure, and an alerting feature that triggered messages requesting additional readings if the input exceeded threshold values and indicating the urgency of setting up an appointment with their physician if the readings remained persistently elevated or low. Features supporting shared decision-making support Six (54.5%) studies29–32,34,36 used shared decision-making support features, such as a summary report feature that enabled patients and providers to share data using the data-entry feature and a communication feature that facilitated scheduling an office visit and exchanging messages to provide encouragement and suggestions to patients and answer questions. Outcomes Effects of mHealth-supported interventions on health outcomes We identified 6 clinical interventions studies26–31 as eligible for inclusion in the effectiveness analysis. Because the study designs, participants, interventions, and reported outcome measures varied markedly, we focused on describing the results of the studies and performing qualitative synthesis rather than meta-analysis. Overall, the clinical intervention studies that measured biomarkers (n = 3)27,29,30 reported promising results. The reported effects included significant reductions in systolic blood pressure,27,29 blood pressure in general,30 and episodes of 24-hour ambulatory blood pressure.30 Only 1 study29 reported a statistically nonsignificant difference in diastolic blood pressure in the intervention group (ie, pre- and posttest evaluations) or between the intervention and control groups; this study also reported that the intervention did not have a significant effect on glucose level (HbA1c). In terms of behavioral and perceptual outcomes, 3 studies26,28,30 reported that the intervention groups had a higher rate of adherence to the medication or measurement schedule and a lower rate of discontinuation. One study,27 however, reported some adverse effects: The intervention group’s depression worsened after the intervention program and was significantly worse than that of the control group. A risk-of-bias assessment of these results23 identified different domains of bias that could have decreased the validity of the studies. As presented in Figure 2, the unrandomized nature of sample selection and unconcealed allocation procedure were the main sources of bias risk in the clinical studies included. For more details about the assessments of risk of bias in individual studies, see the Supplementary Material. Figure 2. Open in new tabDownload slide Risk of bias across clinical studies included (n = 5). Figure 2. Open in new tabDownload slide Risk of bias across clinical studies included (n = 5). User feedback on mHealth technology under investigation The studies that examined patients’ experiences with the mHealth technologies under investigation (n = 9; 81.8%)29–36 reported that the usability and acceptability of the systems were generally high. Findings regarding areas for improvement included connectivity issues between medical devices and mobile terminals,29,35 lack of compatibility and interoperability of the system with different mobile operating systems and terminals,29 lack of integration with health electronic health records,35 and low visibility of the content due to the small screens of mobile devices.30,34 The PICOS classification of the included studies is provided in Table 1. Table 1. Characteristics of the included studies (n = 12) PICOS category . Code . Description (Examples) . n . % . Participants  Age 65+ years old Mean age reported ≥ 65 2 18.2 50–64 years old Mean age reported = 50–64 6 54.5 Unknown Mean age not reported. 3 33.3  Sample size 1–49 Number of participants < 50 5 45.5 50–99 Number of participants = 50–99 2 18.2 100+ Number of participants ≥ 100 4 41.7 Interventions  Procedure Self-monitoring Patients read and recorded biomarkers (eg, blood pressure) by themselves 3 27.3 Knowledge Educational contents were delivered to patients 2 18.2  Duration 1–6 months Intervention lasted for 1–6 months 3 27.3 7–12 months Intervention lasted for 7–12 months 2 18.2  Technologies used or tested Self-management Features allowing patients to monitor their disease progress and be better informed about their chronic health conditions and their symptoms and available treatments (eg, reminder, data entry, educational content) 11 100.0 Decision support Features allowing patients to assess their progress in the self-management (eg, summary report, alerting system) 6 54.5 Shared decision-making Features allowing patients to share data with clinicians and choose ideal treatment together (eg, data repository and transmission, connection with electronic health report systems, presenting summary reports on trends of patients’ conditions and self-management activities over time) 6 54.5 Comparators  Within subjects Pre–post Subjects measured before and after intervention 3 27.3  Between subjects Similar controls Similar subjects measured with and without intervention 4 36.4  None No comparison 6 54.5 Outcomes  Clinical Biomarkers Objectively measured patient health outcomes (eg, blood pressure) 3 27.3 Perceptions and behaviors Self-reported perceptual outcomes (eg, depression, satisfaction with the intervention); health behavior-related outcomes (eg, adherence to medication and measurement schedule) 4 36.4  Technical User feedback on the mHealth technology Perceptions of the system tested (eg, perceived ease of use, intention to accept and continue use, requirements for future implementation); suggestions for improving the usability and usefulness of the system 9 81.8 Study design  Experimental Pre–post study Measured outcome before and after intervention is implemented 2 18.2 RCT Measured outcome of 2 groups of homogenous study participants, 1 of which received an intervention and the other did not 2 18.2  Observational Retrospective cohort study Looked at data created prior to development of outcome to identify which participants developed outcomes of interest 1 9.1  User study Usability testing Evaluated overall quality of system in terms of users’ performance and satisfaction (ie, summative usability evaluation) 5 45.5 Requirements gathering Evaluated system to make improvements in design prior to release (ie, formative usability evaluation) 1 9.1 PICOS category . Code . Description (Examples) . n . % . Participants  Age 65+ years old Mean age reported ≥ 65 2 18.2 50–64 years old Mean age reported = 50–64 6 54.5 Unknown Mean age not reported. 3 33.3  Sample size 1–49 Number of participants < 50 5 45.5 50–99 Number of participants = 50–99 2 18.2 100+ Number of participants ≥ 100 4 41.7 Interventions  Procedure Self-monitoring Patients read and recorded biomarkers (eg, blood pressure) by themselves 3 27.3 Knowledge Educational contents were delivered to patients 2 18.2  Duration 1–6 months Intervention lasted for 1–6 months 3 27.3 7–12 months Intervention lasted for 7–12 months 2 18.2  Technologies used or tested Self-management Features allowing patients to monitor their disease progress and be better informed about their chronic health conditions and their symptoms and available treatments (eg, reminder, data entry, educational content) 11 100.0 Decision support Features allowing patients to assess their progress in the self-management (eg, summary report, alerting system) 6 54.5 Shared decision-making Features allowing patients to share data with clinicians and choose ideal treatment together (eg, data repository and transmission, connection with electronic health report systems, presenting summary reports on trends of patients’ conditions and self-management activities over time) 6 54.5 Comparators  Within subjects Pre–post Subjects measured before and after intervention 3 27.3  Between subjects Similar controls Similar subjects measured with and without intervention 4 36.4  None No comparison 6 54.5 Outcomes  Clinical Biomarkers Objectively measured patient health outcomes (eg, blood pressure) 3 27.3 Perceptions and behaviors Self-reported perceptual outcomes (eg, depression, satisfaction with the intervention); health behavior-related outcomes (eg, adherence to medication and measurement schedule) 4 36.4  Technical User feedback on the mHealth technology Perceptions of the system tested (eg, perceived ease of use, intention to accept and continue use, requirements for future implementation); suggestions for improving the usability and usefulness of the system 9 81.8 Study design  Experimental Pre–post study Measured outcome before and after intervention is implemented 2 18.2 RCT Measured outcome of 2 groups of homogenous study participants, 1 of which received an intervention and the other did not 2 18.2  Observational Retrospective cohort study Looked at data created prior to development of outcome to identify which participants developed outcomes of interest 1 9.1  User study Usability testing Evaluated overall quality of system in terms of users’ performance and satisfaction (ie, summative usability evaluation) 5 45.5 Requirements gathering Evaluated system to make improvements in design prior to release (ie, formative usability evaluation) 1 9.1 Open in new tab Table 1. Characteristics of the included studies (n = 12) PICOS category . Code . Description (Examples) . n . % . Participants  Age 65+ years old Mean age reported ≥ 65 2 18.2 50–64 years old Mean age reported = 50–64 6 54.5 Unknown Mean age not reported. 3 33.3  Sample size 1–49 Number of participants < 50 5 45.5 50–99 Number of participants = 50–99 2 18.2 100+ Number of participants ≥ 100 4 41.7 Interventions  Procedure Self-monitoring Patients read and recorded biomarkers (eg, blood pressure) by themselves 3 27.3 Knowledge Educational contents were delivered to patients 2 18.2  Duration 1–6 months Intervention lasted for 1–6 months 3 27.3 7–12 months Intervention lasted for 7–12 months 2 18.2  Technologies used or tested Self-management Features allowing patients to monitor their disease progress and be better informed about their chronic health conditions and their symptoms and available treatments (eg, reminder, data entry, educational content) 11 100.0 Decision support Features allowing patients to assess their progress in the self-management (eg, summary report, alerting system) 6 54.5 Shared decision-making Features allowing patients to share data with clinicians and choose ideal treatment together (eg, data repository and transmission, connection with electronic health report systems, presenting summary reports on trends of patients’ conditions and self-management activities over time) 6 54.5 Comparators  Within subjects Pre–post Subjects measured before and after intervention 3 27.3  Between subjects Similar controls Similar subjects measured with and without intervention 4 36.4  None No comparison 6 54.5 Outcomes  Clinical Biomarkers Objectively measured patient health outcomes (eg, blood pressure) 3 27.3 Perceptions and behaviors Self-reported perceptual outcomes (eg, depression, satisfaction with the intervention); health behavior-related outcomes (eg, adherence to medication and measurement schedule) 4 36.4  Technical User feedback on the mHealth technology Perceptions of the system tested (eg, perceived ease of use, intention to accept and continue use, requirements for future implementation); suggestions for improving the usability and usefulness of the system 9 81.8 Study design  Experimental Pre–post study Measured outcome before and after intervention is implemented 2 18.2 RCT Measured outcome of 2 groups of homogenous study participants, 1 of which received an intervention and the other did not 2 18.2  Observational Retrospective cohort study Looked at data created prior to development of outcome to identify which participants developed outcomes of interest 1 9.1  User study Usability testing Evaluated overall quality of system in terms of users’ performance and satisfaction (ie, summative usability evaluation) 5 45.5 Requirements gathering Evaluated system to make improvements in design prior to release (ie, formative usability evaluation) 1 9.1 PICOS category . Code . Description (Examples) . n . % . Participants  Age 65+ years old Mean age reported ≥ 65 2 18.2 50–64 years old Mean age reported = 50–64 6 54.5 Unknown Mean age not reported. 3 33.3  Sample size 1–49 Number of participants < 50 5 45.5 50–99 Number of participants = 50–99 2 18.2 100+ Number of participants ≥ 100 4 41.7 Interventions  Procedure Self-monitoring Patients read and recorded biomarkers (eg, blood pressure) by themselves 3 27.3 Knowledge Educational contents were delivered to patients 2 18.2  Duration 1–6 months Intervention lasted for 1–6 months 3 27.3 7–12 months Intervention lasted for 7–12 months 2 18.2  Technologies used or tested Self-management Features allowing patients to monitor their disease progress and be better informed about their chronic health conditions and their symptoms and available treatments (eg, reminder, data entry, educational content) 11 100.0 Decision support Features allowing patients to assess their progress in the self-management (eg, summary report, alerting system) 6 54.5 Shared decision-making Features allowing patients to share data with clinicians and choose ideal treatment together (eg, data repository and transmission, connection with electronic health report systems, presenting summary reports on trends of patients’ conditions and self-management activities over time) 6 54.5 Comparators  Within subjects Pre–post Subjects measured before and after intervention 3 27.3  Between subjects Similar controls Similar subjects measured with and without intervention 4 36.4  None No comparison 6 54.5 Outcomes  Clinical Biomarkers Objectively measured patient health outcomes (eg, blood pressure) 3 27.3 Perceptions and behaviors Self-reported perceptual outcomes (eg, depression, satisfaction with the intervention); health behavior-related outcomes (eg, adherence to medication and measurement schedule) 4 36.4  Technical User feedback on the mHealth technology Perceptions of the system tested (eg, perceived ease of use, intention to accept and continue use, requirements for future implementation); suggestions for improving the usability and usefulness of the system 9 81.8 Study design  Experimental Pre–post study Measured outcome before and after intervention is implemented 2 18.2 RCT Measured outcome of 2 groups of homogenous study participants, 1 of which received an intervention and the other did not 2 18.2  Observational Retrospective cohort study Looked at data created prior to development of outcome to identify which participants developed outcomes of interest 1 9.1  User study Usability testing Evaluated overall quality of system in terms of users’ performance and satisfaction (ie, summative usability evaluation) 5 45.5 Requirements gathering Evaluated system to make improvements in design prior to release (ie, formative usability evaluation) 1 9.1 Open in new tab DISCUSSION Our systematic review provided an overview of the current development and application of mHealth technologies targeting diabetes and hypertension. We found a lack of research examining the effects of mHealth interventions on patients’ self-management of diabetes and hypertension. Among the 11 studies identified, only 5 (45.5%) were clinical intervention studies examining the effects of mHealth technologies on patient health outcomes; the rest (n = 6; 54.5%) were user studies focused on the development or testing of mHealth technologies. In terms of types of mHealth technologies implemented in the included studies, the most common features supported patients’ self-management activities such as recording data (eg, blood pressure, glucose), keeping track of trends in the data, and taking medications (n = 11; 100%), followed by features supporting clinical decisions, such as assessing data based on established guidelines and thresholds (n = 6; 54.5%), and those supporting shared decision-making, such as producing a summary report and facilitating communication between patients and providers (n = 6; 54.5%). The results of the clinical intervention studies (n = 5) show that mHealth technologies can help patients (a) adhere to supposedly more complex drug and diet regimes (eg, sending reminders when medications should be taken, notifying patients when refills are necessary, and assisting in the creation of medication histories) and (b) control biomarkers such as blood pressure and glucose. Regarding technical development and implementation of mHealth interventions, the user studies (n = 6) showed that patients generally perceive mHealth technologies as easy to use and useful for self-managing their health conditions. However, health care providers tend to have reservations about mHealth technology as a self-management tool, questioning the validity of patient-entered data and noting other unintended adverse effects, such as increased anxiety among patients, liability issues, and disruption of workflow. Although the clinical studies (n = 5) generally reported improved outcomes, our assessments were limited by the variability in study designs and outcome measures. Due to the heterogeneous nature and limited number of studies deemed eligible for inclusion in the effects analysis, we could not conduct a meta-analysis of the effects of mHealth-supported intervention programs. We also note that 2 studies reported nonsignificant or adverse effects of the implementation of mHealth interventions.25,28 Moreover, among these clinical studies, we could not necessarily find information on how these interventions were designed or supported efforts to overcome the complexity of managing both diabetes and hypertension. In other words, managing both conditions may not simply involve managing 2 separate conditions at the same time, but also require the patient’s deeper understanding of the nature of MCC to reduce any negative synergy of the 2 conditions. In this respect, future studies that focus on educating patients about the potential interactions among MCC and minimizing the complexity of managing multiple conditions using mHealth technologies may help improve health outcomes in this population. In addition, we suggest that the effects of such interventions on health outcomes, especially perceptual (eg, depression, satisfaction with the intervention) and behavioral (eg, adherence to medication and measurement schedule) outcomes, should be monitored as a whole at the MCC level rather than at the individual condition level. This is important because patients have to live with all the conditions they have all the time, not 1 at a time. For those living with diabetes and hypertension, for example, it would not always be clear whether the changed depression level over a period is attributable to diabetes, hypertension, or both. As for behavioral outcomes, such as adherence to medications, it is important to help patients comply with their whole medication plan rather than medications for individual conditions. Only 2 of the included studies (18.2%) were RCTs.27,29 We suggest that this represents a limitation, in relation to the meaningful evaluation of the effects of mHealth technology-supported interventions, and that future studies of mHealth interventions could improve the quality of evaluation results by employing an RCT study design. We also note that the nonrandomized nature of the study designs resulted in a relatively high risk of bias in the study results (Figure 2; for more details, see Supplementary Material). Notwithstanding these limitations, our assessment of the narrative review of the included studies suggests that mHealth technology interventions may represent promising areas for future research. The current interventions were intended to enable users to record personal health data, receive useful tips or suggestions to deal with diabetes and hypertension, and facilitate communication between patients and their providers. Further investigation of the implementation of these technologies using robust study designs that minimize the risk of bias is needed. Future evaluations should carefully consider the outcome measures that they report to ensure they are likely to be of relevance to key stakeholders. Ideally, these outcome sets should include objectively measured patient health outcomes and adverse events to allow a full appraisal of the effects of the intervention being investigated. Lastly, considering the inevitably unique and complex nature of self–managing-specific MCC, future research could focus first on diseases that are pathologically similar and often co-occur (eg, diabetes and hypertension). Then, we could gradually target concurrent diseases that are pathologically different (eg, diabetes and arthritis). Once more solid evidence has accumulated, a universal mHealth app that allows patients to self-manage as many and as varied chronic conditions as they want could be developed. CONCLUSION Future research with more randomized clinical trials is necessary to better understand the potential health benefits of mHealth technologies as assistive tools to facilitate the self-management of the highly prevalent comorbidity of chronic conditions, such as diabetes and hypertension. FUNDING This research received no specific grant from any funding agency in the public, commercial, or nonprofit sectors. AUTHOR CONTRIBUTIONS WC designed the search strategy and data collection instruments; reviewed the identified titles, abstracts, and full text (when needed) for inclusion in the review; completed the data collection process; carried out the analyses; and produced the initial manuscript. SW contributed to the development of the study protocol; reviewed the titles, abstracts, and selected articles identified during the database searches to identify relevant studies for inclusion in the review; and contributed to the drafting of the initial manuscript. YL helped prepare the review protocol; reviewed the full text of included articles to extract key information against the review protocol; conducted the risk-of-bias assessment; and critically reviewed and revised the manuscript for important intellectual content. HO reviewed the full text of included studies to extract key information against the review protocol, especially the clinical aspects of the interventions and associated outcomes; conducted the risk-of-bias assessment; and critically reviewed and revised the manuscript for important intellectual content. ZZ reviewed the full text of included articles to extract information against the review protocol, especially the technical specifications of the mHealth technologies and associated outcomes; and critically reviewed and revised the manuscript for important intellectual content. All authors reviewed and approved the manuscript before submission. SUPPLEMENTARY MATERIAL Supplementary material is available at Journal of the American Medical Informatics Association online. CONFLICT OF INTEREST None to declare. REFERENCES 1 Medical Subject Headings (MeSH). Chronic disease. https://www.ncbi.nlm.nih.gov/mesh/68002908. Accessed April 1, 2020. 2 Centers for Disease Control Prevention. About chronic disease. https://www.cdc.gov/chronicdisease/about/index.htmAccessed August 12, 2019 3 Buttorff C , Ruder T, Bauman M. Multiple Chronic Conditions in the United States . Santa Monica, CA : RAND Corporation ; 2017 . Google Scholar Crossref Search ADS Google Scholar Google Preview WorldCat COPAC 4 Cheung BM , Li C. Diabetes and hypertension: is there a common metabolic pathway? Curr Atheroscler Rep 2012 ; 14 ( 2 ): 160 – 6 . Google Scholar Crossref Search ADS PubMed WorldCat 5 Fox CS , Golden SH, Anderson C, et al. . Update on prevention of cardiovascular disease in adults with type 2 diabetes mellitus in light of recent evidence: a scientific statement from the American Heart Association and the American Diabetes Association . Circulation 2015 ; 132 ( 8 ): 691 – 718 . Google Scholar Crossref Search ADS PubMed WorldCat 6 Center for Medicare & Medicaid Services. Co-morbidity. https://www.cms.gov/Research-Statistics-Data-and-Systems/Statistics-Trends-and-Reports/Chronic-Conditions/Co-morbidity.html AccessedAugust 23, 2019 7 Ferrannini E , Cushman WC. Diabetes and hypertension: the bad companions . Lancet 2012 ; 380 ( 9841 ): 601 – 10 . Google Scholar Crossref Search ADS PubMed WorldCat 8 Hopman P , Schellevis FG, Rijken M. Health-related needs of people with multiple chronic diseases: differences and underlying factors . Qual Life Res 2016 ; 25 ( 3 ): 651 – 60 . Google Scholar Crossref Search ADS PubMed WorldCat 9 Kumar S , Nilsen WJ, Abernethy A, et al. . Mobile health technology evaluation: the mHealth evidence workshop . Am J Prev Med 2013 ; 45 ( 2 ): 228 – 36 . Google Scholar Crossref Search ADS PubMed WorldCat 10 Anderson M. Mobile Technology and Home Broadband 2019 . Washington, DC : Pew Research Center ; 2019 . Google Scholar Google Preview OpenURL Placeholder Text WorldCat COPAC 11 Anderson M , Perrin A. Tech Adoption Climbs among Older Adults . Washington, DC : Pew Research Center ; 2017 . Google Scholar Google Preview OpenURL Placeholder Text WorldCat COPAC 12 QVIA Institute for Human Data Science. The growing value of digital health. https://www.iqvia.com/insights/the-iqvia-institute/reports/the-growing-value-of-digital-health Accessed December 12, 2019 13 Martinez-Perez B , de la Torre-Diez I, Lopez-Coronado M. Mobile health applications for the most prevalent conditions by the World Health Organization: review and analysis . J Med Internet Res 2013 ; 15 ( 6 ): e120 . Google Scholar Crossref Search ADS PubMed WorldCat 14 Wang S , Lee HS, Choi W. Assessing the informativeness of user reviews on mobile health applications for chronic diseases . Proc Assoc Inf Sci Technol 2019 ; 56 ( 1 ): 790 – 1 . Google Scholar Crossref Search ADS WorldCat 15 Payne HE , Lister C, West JH, et al. . Behavioral functionality of mobile apps in health interventions: a systematic review of the literature . JMIR Mhealth Uhealth 2015 ; 3 ( 1 ): e20 . Google Scholar Crossref Search ADS PubMed WorldCat 16 Bailey SC , Belter LT, Pandit AU, et al. . The availability, functionality, and quality of mobile applications supporting medication self-management . J Am Med Inform Assoc 2014 ; 21 ( 3 ): 542 – 6 . Google Scholar Crossref Search ADS PubMed WorldCat 17 Donevant SB , Estrada RD, Culley JM, et al. . Exploring app features with outcomes in mHealth studies involving chronic respiratory diseases, diabetes, and hypertension: a targeted exploration of the literature . J Am Med Inform Assoc 2018 ; 25 ( 10 ): 1407 – 18 . Google Scholar Crossref Search ADS PubMed WorldCat 18 Quinn CC , Shardell MD, Terrin ML, et al. . Cluster-randomized trial of a mobile phone personalized behavioral intervention for blood glucose control . Diabetes Care 2011 ; 34 ( 9 ): 1934 – 42 . Google Scholar Crossref Search ADS PubMed WorldCat 19 Heitkemper EM , Mamykina L, Travers J, et al. . Do health information technology self-management interventions improve glycemic control in medically underserved adults with diabetes? a systematic review and meta-analysis . J Am Med Inform Assoc 2017 ; 24 ( 5 ): 1024 – 35 . Google Scholar Crossref Search ADS PubMed WorldCat 20 Hui CY , Walton R, McKinstry B, et al. . The use of mobile applications to support self-management for people with asthma: a systematic review of controlled studies to identify features associated with clinical effectiveness and adherence . J Am Med Inform Assoc 2017 ; 24 ( 3 ): 619 – 32 . Google Scholar PubMed OpenURL Placeholder Text WorldCat 21 Liberati A , Altman DG, Tetzlaff J, et al. . The PRISMA statement for reporting systematic reviews and meta-analyses of studies that evaluate health care interventions: explanation and elaboration . PLOS Med 2009 ; 6 ( 7 ): e1000100 . Google Scholar Crossref Search ADS PubMed WorldCat 22 US National Library of Medicine. Medical Subject Headings (MeSH). https://meshb.nlm.nih.gov/searchAccessed August 12, 2019 23 Higgins JP , Green S. Cochrane Handbook for Systematic Reviews of Interventions . Vol 4 . New York : John Wiley & Sons ; 2011 . Google Scholar Google Preview OpenURL Placeholder Text WorldCat COPAC 24 Nordic Cochrane Centre. Review Manager (RevMan) [Computer Program]. Version 5.3. Copenhagen: Nordic Cochrane Centre; 2014 . 25 Choi W , Zheng H, Franklin P, et al. . mHealth technologies for osteoarthritis self-management and treatment: a systematic review . Health Informatics J 2019 ; 25 ( 3 ): 984 – 1003 . Google Scholar Crossref Search ADS PubMed WorldCat 26 Abughosh SM , Wang X, Serna O, et al. . A pharmacist telephone intervention to identify adherence barriers and improve adherence among nonadherent patients with comorbid hypertension and diabetes in a Medicare advantage plan . J Manag Care Spec Pharm 2016 ; 22 ( 1 ): 63 – 73 . 27 Logan AG , Irvine MJ, McIsaac WJ, et al. . Effect of home blood pressure telemonitoring with self-care support on uncontrolled systolic hypertension in diabetics . Hypertension 2012 ; 60 ( 1 ): 51 – 7 . Google Scholar Crossref Search ADS PubMed WorldCat 28 Yeung DL , Alvarez KS, Quinones ME, et al. . Low-health literacy flashcards & mobile video reinforcement to improve medication adherence in patients on oral diabetes, heart failure, and hypertension medications . J Am Pharm Assoc 2017 ; 57 : 30 – 7 . Google Scholar Crossref Search ADS WorldCat 29 Istepanian RS , Sungoor A, Earle KA. Technical and compliance considerations for mobile health self-monitoring of glucose and blood pressure for patients with diabetes. Paper presented at 2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society; September 2–6, 2009; Minneapolis, MN. 30 Logan AG , McIsaac WJ, Tisler A, et al. . Mobile phone-based remote patient monitoring system for management of hypertension in diabetic patients: phase II . Am J Hypertens 2007 ; 20 ( 9 ): 942 – 8 . Google Scholar Crossref Search ADS PubMed WorldCat 31 Banerjee A , Ramanujan RA, Agnihothri S. Mobile health monitoring: development and implementation of an app in a diabetes and hypertension clinic. Paper presented at 2016 49th Hawaii International Conference on System Sciences; January 5–8, 2016; Kauai, HI. 32 Logan AG , McIsaac WJ, Tisler A, et al. . Mobile phone-based remote patient monitoring system for management of hypertension in diabetic patients: phase I . Am J Hypertens 2007 ; 20 ( 9 ): 942 – 8 . Google Scholar Crossref Search ADS PubMed WorldCat 33 Siddiqui M , Islam MY, Mufti BA, et al. . Assessing acceptability of hypertensive/diabetic patients towards mobile health based behavioral interventions in Pakistan: a pilot study . Int J Med Inform 2015 ; 84 ( 11 ): 950 – 5 . Google Scholar Crossref Search ADS PubMed WorldCat 34 Smith-Turchyn J , Gravesande J, Agarwal G, et al. . A healthy lifestyle app for older adults with diabetes and hypertension: usability assessment . Int J Healthc Technol Manag 2017 ; 16 ( 3/4 ): 250 – 70 . 35 Sultan S , Mohan P. How to interact: evaluating the interface between mobile healthcare systems and the monitoring of blood sugar and blood pressure. Paper presented at Mobile and Ubiquitous Systems: Networking & Services; July 13–16, 2009 ; Toronto, Canada. 36 Thies K , Anderson D, Cramer B. Lack of adoption of a mobile app to support patient self-management of diabetes and hypertension in a federally qualified health center: interview analysis of staff and patients in a failed randomized trial . JMIR Hum Factors 2017 ; 4 ( 4 ): e24 . Google Scholar Crossref Search ADS PubMed WorldCat © The Author(s) 2020. Published by Oxford University Press on behalf of the American Medical Informatics Association. All rights reserved. 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A systematic review of mobile health technologies to support self-management of concurrent diabetes and hypertension

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Publisher
Oxford University Press
Copyright
© The Author(s) 2020. Published by Oxford University Press on behalf of the American Medical Informatics Association. All rights reserved. For permissions, please email: journals.permissions@oup.com
ISSN
1067-5027
eISSN
1527-974X
DOI
10.1093/jamia/ocaa029
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Abstract

Abstract Objective This article reports results from a systematic literature review of the current state of mobile health (mHealth) technologies that have the potential to support self-management for people with diabetes and hypertension. The review aims to (a) characterize mHealth technologies used or described in the mHealth literature and (b) summarize their effects on self-management for people with diabetes and hypertension from the clinical and technical standpoints. Materials and Methods A systematic literature review was conducted following PRISMA guidelines. Online databases were searched in September 2018 to identify eligible studies for review that had been published since 2007, the start of the smartphone era. Data were extracted from included studies based on the PICOS framework. Results Of the 11 studies included for in-depth review, 5 were clinical research examining patient health outcomes and 6 were technology-focused studies examining users’ experiences with mHealth technologies under development. The most frequently used mHealth technology features involved self-management support (n = 11) followed by decision support (n = 6) and shared decision-making (n = 6). Most clinical studies reported benefits associated with mHealth interventions. These included reported improvements in objectively measured patient health outcomes (n = 3) and perceptual or behavioral outcomes (n = 4). Discussion Although most studies reported promising results in terms of the effects of mHealth interventions on patient health outcomes and experience, the strength of evidence was limited by the study designs. Conclusion More randomized clinical trials are needed to examine the promise and limitations of mHealth technologies as assistive tools to facilitate the self-management of highly prevalent comorbidity of chronic conditions, such as diabetes and hypertension. mobile health, mHealth, multiple chronic conditions, diabetes mellitus, hypertension INTRODUCTION Chronic diseases such as heart disease, cancer, and diabetes are permanent, leave residual disability, and require long periods of supervision, observation, and care.1,2 About 42% of the overall population of American adults and 81% of those 65 years old or older had 2 or more concurrent chronic conditions (ie, multiple chronic conditions [MCC]) as of 2014.3 Among prevalent chronic diseases, diabetes and hypertension often develop together because they are highly related pathogenetically.4 In 2015, two-thirds of diabetic patients had hypertension5 and 33.1% of all Medicaid and Medicare beneficiaries had both conditions.6 The negative synergy of this dyad precipitates significant microvascular (eg, kidney diseases) and macrovascular (eg, myocardial infarction, stroke) complications that may result in the need for dialysis or limb amputation.5,7 Research evidence shows that people with MCC, such as those with diabetes and hypertension, use more health services (eg, emergency and clinic visits, hospitalization, prescriptions), have more medical expenditures, and experience greater difficulties with activities of daily living (eg, bathing, dressing, eating) and other social and cognitive functions (eg, participating in social or family activities) compared to those with a single condition.3,8 Mobile health (mHealth) technology is defined as wireless devices and sensors intended to be worn, carried, or accessed by patients or health care providers for monitoring health status or improving health outcomes.9 Given the increased penetration rate of smartphones—81% of American adults owned a smartphone as of 2019,10 which is a dramatic increase from 35% in 201111—advanced mHealth technologies implemented in smartphones such as Bluetooth, motion-detecting sensors (eg, accelerometer, gyroscope), global positioning system (GPS), and software applications (apps) have great potential to deliver health care services customized for individuals in terms of timing, location, and needs. In the marketplace, more than 318 000 mHealth apps are available for download,12 many of which have been developed for patients with prevalent chronic conditions, such as diabetes and hypertension.13 In the Google Play Store, for example, 241 apps for diabetes and 208 apps for hypertension were identified as of 2019.14 Although the efficacy of mHealth interventions reported in the literature has been inconclusive, many studies have reported promising results of mHealth interventions in improving patient outcomes such as body measures (eg, weight, waist circumference), metabolic and physiological measures (eg, blood pressure, glucose), adherence to and safe use of medications, physical activity, diet management, and awareness of health conditions and treatment options.15–17 Previous reviews, however, focused mainly on mHealth interventions for a single condition (eg, diabetes, weight loss, asthma)18–20 or dealt with a group of diseases individually (eg, respiratory disease, diabetes, hypertension),13,17 not MCC. To address this gap in the literature, we systematically reviewed articles that used or developed mHealth technologies, or both, as an assistive tool to support self-management of MCC with a focus on diabetes and hypertension. In particular, we included both clinical studies that examined the effect of mHealth technology on patient outcomes (eg, biomarkers, perceptions, behaviors) and nonclinical user studies focusing on the development and testing of mHealth technologies for diabetes and hypertension. The included articles, therefore, used different study designs such as randomized trials, cohort studies, and case reports that used or developed (or both) mHealth technologies for patients with both diabetes and hypertension. The goal of this systematic review is to advance our understanding of currently available mHealth technologies for diabetes and hypertension and the potential and limitations of mHealth interventions to improve various aspects of patient outcomes. To our knowledge, this is the first systematic review of the efficacy of mHealth interventions targeting diabetes and hypertension. MATERIALS AND METHODS Literature search strategy and screening process We developed a study protocol in compliance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines.21 Eligibility criteria for publications were (a) original research articles published in peer-reviewed journals or conference proceedings; (b) reported findings from a study that developed or used (or both) mHealth technology to support patients’ self-management of both diabetes and hypertension; (c) written in English; and (d) published in or after 2007, the year when the first smartphone (the iPhone) was introduced, after which mHealth apps could be developed. We excluded articles that (a) only focused on 1 condition, (b) broadly discussed chronic conditions without focusing on both diabetes and hypertension, or (c) covered both diseases yet ignored mHealth technology as an assistive tool in the interventions. Based on Medical Subject Headings22 and literature browsing, we identified 2 groups of search terms to retrieve an exhaustive collection of relevant articles meeting the eligibility criteria: (a) disease-related terms (eg, diabetes, diabetics, hypertension, high blood pressure) and (b) mHealth technology-related terms (eg, mobile health application, mHealth, smartphone). We searched 5 electronic databases (PubMed, Web of Science, ScienceDirect, Association for Computing Machinery Digital Library, and Institute of Electrical and Electronics Engineering Xplore Digital Library) and scanned reference lists of articles (for more details on search queries and results by database, see Supplementary Material). The last search was run on September 17, 2018. Two members of the review team (which included all authors of this paper), screened the titles and abstracts of the retrieved articles to evaluate their relevance to the present review. When an article’s relevance could not be determined by its title and abstract, the full text was reviewed by the 2 reviewers. Data collection and analysis Overall, relevant articles were recorded on a data extraction form based on the PICOS criteria. Specifically, the participant (P) criterion focused on describing the characteristics of the participants in each study (eg, target audience, age); the intervention (I) criterion involved analyzing the procedure of clinical interventions and the types of mHealth technology features used in the studies; the comparator (C) criterion focused on identifying the subgroups of participants that were compared to evaluate the effects of interventions in each study (eg, same group before and after a given intervention, similar groups with and without intervention); the outcome (O) criterion analyzed the effects of the interventions on self-management and treatment of diabetes and hypertension; and the study design (S) criterion described the methodological characteristics of the studies. A risk-of-bias assessment was completed for the clinical studies (n = 5), consisting of randomized controlled trials (RCTs), pre–post evaluation studies, and cohort studies using the Cochrane Collaboration’s tool for assessing risk of bias.23 Review Manager 5.324 was used to record and generate a risk-of-bias graph. The mHealth technology features implemented in the included studies were categorized into 3 groups based on an existing design framework for mHealth apps targeting chronic conditions:25 (a) a self-management module enabling patients to record their biomarkers (eg, blood pressure, glucose) and other helpful activities (eg, diet management, physical activities, medication adherence) and receive credible information about their health conditions (eg, symptoms, treatment options); (b) a decision support module helping patients assess their progress and current status regarding self-management and detect abnormal or urgent situations requiring their providers’ special attention (eg, feedback on readings, alerting system); and (c) a shared decision-making module allowing patients to share their data with clinicians and choose optimal treatment options together (eg, data repository and transmission, connection with electronic health report systems, summary reports on trends of patients’ conditions and self-management activities over time). Two reviewers (WC, SW) analyzed included articles to identify relevant information for the PICOS criteria. The other 3 authors addressed a subset of the criteria based on their expertise: One (YL) focused on analyzing the characteristics of the participants and design of the included studies; the second (HO) analyzed the clinical aspects of the interventions and associated outcomes; and the third (ZZ) focused on the technical specifications of the mHealth technologies and associated outcomes. An online spreadsheet was shared among all authors to store information extracted from eligible publications. Disagreements were resolved by discussion among the relevant review authors (a subset or all of the authors). RESULTS Our search yielded 657 publications. After removing duplicates, 366 unique publications were identified. Of the 366 publications whose titles and abstracts were reviewed, 12 were identified as eligible for full-text review. Two additional publications meeting the eligibility criteria were identified from the references of the 12 full-text publications reviewed. Of the 14 publications, 4 were excluded due to not meeting the following criteria: One did not involve both diabetes and hypertension; 2 other studies did not involve the patient–mHealth technology interaction; and the last was not an original research paper—it was a review paper. Of the 10 eligible publications, 1 reported 2 distinct studies (phases I and II; see Logan, 2007, in the online Supplementary Material), resulting in 11 studies to be analyzed (see Figure 1 for the PRISMA flow diagram describing the overall search and selection process). Overall, 5 of the 11 included studies (45.5%) were clinical intervention studies focused mainly on examining the effects of mHealth technologies on health outcomes,26–30 whereas the remaining 6 studies (54.5%) were user studies focused on the development and usability testing of mHealth technology under investigation.31–36 We included both clinical and nonclinical types to understand the overall scope of mHealth-based studies in this field. More specifically, we aimed to survey currently available mHealth technologies used to deliver interventions to the target audience in clinical studies and technologies under development. Figure 1. Open in new tabDownload slide PRISMA flow diagram indicating results of identification and screening process for included and excluded papers. Figure 1. Open in new tabDownload slide PRISMA flow diagram indicating results of identification and screening process for included and excluded papers. Characteristics of included studies Of the 11 included studies, 7 (63.6%)26–28,31,33,34,36 were published in or after 2012; the remaining 4 (36.4%)29,30,32,35 were published between 2007 and 2009. The majority of the studies were conducted in North America (n = 8; 72.7%),26–28,30–32,34,36 followed by Asia (n = 1; 9.1%)33 and Europe (n = 1; 9.1%);29 1 report (n = 1; 9.1%)35 did not specify the location of the study. Eight of the 11 studies (72.7%)26–28,30,32–34,36 were published in peer-reviewed journals and 3 (27.3%)29,31,35 were published in peer-reviewed conference proceedings (report characteristics are summarized in the online Supplementary Material). Five studies (45.5%)30,32,34–36 had a sample size smaller than 50; 2 (18.2%)28,33 had a sample of 50–100; and 4 (36.4%)26,27,29,31 had a sample size larger than 100. The ages of the participants ranged from 45 to 70 years old. Two (18.2%)28,30 used a pre–post study design; 2 (18.2%)27,29 were RCTs; 1 (9.1%)26 was a retrospective cohort study; 5 (45.5%)31,33–36 were usability studies; and 1 (9.1%)32 focused on gathering users’ requirements for the app under development. In terms of interventions, 3 studies (27.3%)27,29,30 asked patients to take biomarkers (eg, blood pressure, glucose) by themselves on a regular basis and 2 (18.2%)26,28 delivered educational interventions to patients using mHealth technology. The 6 technology-focused user studies (50%)31–36 did not involve an intervention. The duration of the interventions implemented in the clinical studies ranged from 3 to 20 months (study characteristics are summarized in the Supplementary Material). mHealth technologies for self-management interventions targeting diabetes and hypertension In terms of technology types used, 3 studies (27.3%)31,35,36 used mHealth apps designed for mobile devices, especially smartphones; 4 (36.4%)26,27,29,34 used generic mobile phone functions such as calling, texting, or reading a QR code; 5 (45.5%)28,29,31,34,36 used web interfaces for visualization and sharing of patient data with providers; and 5 (45.5%)27,29,30,32,35 incorporated Bluetooth-enabled devices for reading biomarkers, such as blood pressure and glucose. Features supporting patients’ self-management All of the 11 studies (100%)26–36 used self–management-related features as follows. A reminder feature helped patients adhere to prescribed medications and encouraged them to enter data into the system. A data entry feature allowed users to log different types of data such as medical indicators (eg, blood pressure, glucose), diet (eg, nutrition information, calories), and physical activities (type and duration of exercise). A feedback feature generated feedback messages to inform users about their progress in the self-management of their chronic conditions. An education feature provided educational content to improve patients’ understanding of their conditions, in general, and address potential questions patients might have regarding the medications they were taking, new symptoms they had, and how to manage them. Features supporting clinical decision Six (54.5%) studies29–32,34,36 used clinical decision support features, such as an assessment feature that interpreted readings based on guidelines and thresholds for important biomarkers, such as blood pressure, and an alerting feature that triggered messages requesting additional readings if the input exceeded threshold values and indicating the urgency of setting up an appointment with their physician if the readings remained persistently elevated or low. Features supporting shared decision-making support Six (54.5%) studies29–32,34,36 used shared decision-making support features, such as a summary report feature that enabled patients and providers to share data using the data-entry feature and a communication feature that facilitated scheduling an office visit and exchanging messages to provide encouragement and suggestions to patients and answer questions. Outcomes Effects of mHealth-supported interventions on health outcomes We identified 6 clinical interventions studies26–31 as eligible for inclusion in the effectiveness analysis. Because the study designs, participants, interventions, and reported outcome measures varied markedly, we focused on describing the results of the studies and performing qualitative synthesis rather than meta-analysis. Overall, the clinical intervention studies that measured biomarkers (n = 3)27,29,30 reported promising results. The reported effects included significant reductions in systolic blood pressure,27,29 blood pressure in general,30 and episodes of 24-hour ambulatory blood pressure.30 Only 1 study29 reported a statistically nonsignificant difference in diastolic blood pressure in the intervention group (ie, pre- and posttest evaluations) or between the intervention and control groups; this study also reported that the intervention did not have a significant effect on glucose level (HbA1c). In terms of behavioral and perceptual outcomes, 3 studies26,28,30 reported that the intervention groups had a higher rate of adherence to the medication or measurement schedule and a lower rate of discontinuation. One study,27 however, reported some adverse effects: The intervention group’s depression worsened after the intervention program and was significantly worse than that of the control group. A risk-of-bias assessment of these results23 identified different domains of bias that could have decreased the validity of the studies. As presented in Figure 2, the unrandomized nature of sample selection and unconcealed allocation procedure were the main sources of bias risk in the clinical studies included. For more details about the assessments of risk of bias in individual studies, see the Supplementary Material. Figure 2. Open in new tabDownload slide Risk of bias across clinical studies included (n = 5). Figure 2. Open in new tabDownload slide Risk of bias across clinical studies included (n = 5). User feedback on mHealth technology under investigation The studies that examined patients’ experiences with the mHealth technologies under investigation (n = 9; 81.8%)29–36 reported that the usability and acceptability of the systems were generally high. Findings regarding areas for improvement included connectivity issues between medical devices and mobile terminals,29,35 lack of compatibility and interoperability of the system with different mobile operating systems and terminals,29 lack of integration with health electronic health records,35 and low visibility of the content due to the small screens of mobile devices.30,34 The PICOS classification of the included studies is provided in Table 1. Table 1. Characteristics of the included studies (n = 12) PICOS category . Code . Description (Examples) . n . % . Participants  Age 65+ years old Mean age reported ≥ 65 2 18.2 50–64 years old Mean age reported = 50–64 6 54.5 Unknown Mean age not reported. 3 33.3  Sample size 1–49 Number of participants < 50 5 45.5 50–99 Number of participants = 50–99 2 18.2 100+ Number of participants ≥ 100 4 41.7 Interventions  Procedure Self-monitoring Patients read and recorded biomarkers (eg, blood pressure) by themselves 3 27.3 Knowledge Educational contents were delivered to patients 2 18.2  Duration 1–6 months Intervention lasted for 1–6 months 3 27.3 7–12 months Intervention lasted for 7–12 months 2 18.2  Technologies used or tested Self-management Features allowing patients to monitor their disease progress and be better informed about their chronic health conditions and their symptoms and available treatments (eg, reminder, data entry, educational content) 11 100.0 Decision support Features allowing patients to assess their progress in the self-management (eg, summary report, alerting system) 6 54.5 Shared decision-making Features allowing patients to share data with clinicians and choose ideal treatment together (eg, data repository and transmission, connection with electronic health report systems, presenting summary reports on trends of patients’ conditions and self-management activities over time) 6 54.5 Comparators  Within subjects Pre–post Subjects measured before and after intervention 3 27.3  Between subjects Similar controls Similar subjects measured with and without intervention 4 36.4  None No comparison 6 54.5 Outcomes  Clinical Biomarkers Objectively measured patient health outcomes (eg, blood pressure) 3 27.3 Perceptions and behaviors Self-reported perceptual outcomes (eg, depression, satisfaction with the intervention); health behavior-related outcomes (eg, adherence to medication and measurement schedule) 4 36.4  Technical User feedback on the mHealth technology Perceptions of the system tested (eg, perceived ease of use, intention to accept and continue use, requirements for future implementation); suggestions for improving the usability and usefulness of the system 9 81.8 Study design  Experimental Pre–post study Measured outcome before and after intervention is implemented 2 18.2 RCT Measured outcome of 2 groups of homogenous study participants, 1 of which received an intervention and the other did not 2 18.2  Observational Retrospective cohort study Looked at data created prior to development of outcome to identify which participants developed outcomes of interest 1 9.1  User study Usability testing Evaluated overall quality of system in terms of users’ performance and satisfaction (ie, summative usability evaluation) 5 45.5 Requirements gathering Evaluated system to make improvements in design prior to release (ie, formative usability evaluation) 1 9.1 PICOS category . Code . Description (Examples) . n . % . Participants  Age 65+ years old Mean age reported ≥ 65 2 18.2 50–64 years old Mean age reported = 50–64 6 54.5 Unknown Mean age not reported. 3 33.3  Sample size 1–49 Number of participants < 50 5 45.5 50–99 Number of participants = 50–99 2 18.2 100+ Number of participants ≥ 100 4 41.7 Interventions  Procedure Self-monitoring Patients read and recorded biomarkers (eg, blood pressure) by themselves 3 27.3 Knowledge Educational contents were delivered to patients 2 18.2  Duration 1–6 months Intervention lasted for 1–6 months 3 27.3 7–12 months Intervention lasted for 7–12 months 2 18.2  Technologies used or tested Self-management Features allowing patients to monitor their disease progress and be better informed about their chronic health conditions and their symptoms and available treatments (eg, reminder, data entry, educational content) 11 100.0 Decision support Features allowing patients to assess their progress in the self-management (eg, summary report, alerting system) 6 54.5 Shared decision-making Features allowing patients to share data with clinicians and choose ideal treatment together (eg, data repository and transmission, connection with electronic health report systems, presenting summary reports on trends of patients’ conditions and self-management activities over time) 6 54.5 Comparators  Within subjects Pre–post Subjects measured before and after intervention 3 27.3  Between subjects Similar controls Similar subjects measured with and without intervention 4 36.4  None No comparison 6 54.5 Outcomes  Clinical Biomarkers Objectively measured patient health outcomes (eg, blood pressure) 3 27.3 Perceptions and behaviors Self-reported perceptual outcomes (eg, depression, satisfaction with the intervention); health behavior-related outcomes (eg, adherence to medication and measurement schedule) 4 36.4  Technical User feedback on the mHealth technology Perceptions of the system tested (eg, perceived ease of use, intention to accept and continue use, requirements for future implementation); suggestions for improving the usability and usefulness of the system 9 81.8 Study design  Experimental Pre–post study Measured outcome before and after intervention is implemented 2 18.2 RCT Measured outcome of 2 groups of homogenous study participants, 1 of which received an intervention and the other did not 2 18.2  Observational Retrospective cohort study Looked at data created prior to development of outcome to identify which participants developed outcomes of interest 1 9.1  User study Usability testing Evaluated overall quality of system in terms of users’ performance and satisfaction (ie, summative usability evaluation) 5 45.5 Requirements gathering Evaluated system to make improvements in design prior to release (ie, formative usability evaluation) 1 9.1 Open in new tab Table 1. Characteristics of the included studies (n = 12) PICOS category . Code . Description (Examples) . n . % . Participants  Age 65+ years old Mean age reported ≥ 65 2 18.2 50–64 years old Mean age reported = 50–64 6 54.5 Unknown Mean age not reported. 3 33.3  Sample size 1–49 Number of participants < 50 5 45.5 50–99 Number of participants = 50–99 2 18.2 100+ Number of participants ≥ 100 4 41.7 Interventions  Procedure Self-monitoring Patients read and recorded biomarkers (eg, blood pressure) by themselves 3 27.3 Knowledge Educational contents were delivered to patients 2 18.2  Duration 1–6 months Intervention lasted for 1–6 months 3 27.3 7–12 months Intervention lasted for 7–12 months 2 18.2  Technologies used or tested Self-management Features allowing patients to monitor their disease progress and be better informed about their chronic health conditions and their symptoms and available treatments (eg, reminder, data entry, educational content) 11 100.0 Decision support Features allowing patients to assess their progress in the self-management (eg, summary report, alerting system) 6 54.5 Shared decision-making Features allowing patients to share data with clinicians and choose ideal treatment together (eg, data repository and transmission, connection with electronic health report systems, presenting summary reports on trends of patients’ conditions and self-management activities over time) 6 54.5 Comparators  Within subjects Pre–post Subjects measured before and after intervention 3 27.3  Between subjects Similar controls Similar subjects measured with and without intervention 4 36.4  None No comparison 6 54.5 Outcomes  Clinical Biomarkers Objectively measured patient health outcomes (eg, blood pressure) 3 27.3 Perceptions and behaviors Self-reported perceptual outcomes (eg, depression, satisfaction with the intervention); health behavior-related outcomes (eg, adherence to medication and measurement schedule) 4 36.4  Technical User feedback on the mHealth technology Perceptions of the system tested (eg, perceived ease of use, intention to accept and continue use, requirements for future implementation); suggestions for improving the usability and usefulness of the system 9 81.8 Study design  Experimental Pre–post study Measured outcome before and after intervention is implemented 2 18.2 RCT Measured outcome of 2 groups of homogenous study participants, 1 of which received an intervention and the other did not 2 18.2  Observational Retrospective cohort study Looked at data created prior to development of outcome to identify which participants developed outcomes of interest 1 9.1  User study Usability testing Evaluated overall quality of system in terms of users’ performance and satisfaction (ie, summative usability evaluation) 5 45.5 Requirements gathering Evaluated system to make improvements in design prior to release (ie, formative usability evaluation) 1 9.1 PICOS category . Code . Description (Examples) . n . % . Participants  Age 65+ years old Mean age reported ≥ 65 2 18.2 50–64 years old Mean age reported = 50–64 6 54.5 Unknown Mean age not reported. 3 33.3  Sample size 1–49 Number of participants < 50 5 45.5 50–99 Number of participants = 50–99 2 18.2 100+ Number of participants ≥ 100 4 41.7 Interventions  Procedure Self-monitoring Patients read and recorded biomarkers (eg, blood pressure) by themselves 3 27.3 Knowledge Educational contents were delivered to patients 2 18.2  Duration 1–6 months Intervention lasted for 1–6 months 3 27.3 7–12 months Intervention lasted for 7–12 months 2 18.2  Technologies used or tested Self-management Features allowing patients to monitor their disease progress and be better informed about their chronic health conditions and their symptoms and available treatments (eg, reminder, data entry, educational content) 11 100.0 Decision support Features allowing patients to assess their progress in the self-management (eg, summary report, alerting system) 6 54.5 Shared decision-making Features allowing patients to share data with clinicians and choose ideal treatment together (eg, data repository and transmission, connection with electronic health report systems, presenting summary reports on trends of patients’ conditions and self-management activities over time) 6 54.5 Comparators  Within subjects Pre–post Subjects measured before and after intervention 3 27.3  Between subjects Similar controls Similar subjects measured with and without intervention 4 36.4  None No comparison 6 54.5 Outcomes  Clinical Biomarkers Objectively measured patient health outcomes (eg, blood pressure) 3 27.3 Perceptions and behaviors Self-reported perceptual outcomes (eg, depression, satisfaction with the intervention); health behavior-related outcomes (eg, adherence to medication and measurement schedule) 4 36.4  Technical User feedback on the mHealth technology Perceptions of the system tested (eg, perceived ease of use, intention to accept and continue use, requirements for future implementation); suggestions for improving the usability and usefulness of the system 9 81.8 Study design  Experimental Pre–post study Measured outcome before and after intervention is implemented 2 18.2 RCT Measured outcome of 2 groups of homogenous study participants, 1 of which received an intervention and the other did not 2 18.2  Observational Retrospective cohort study Looked at data created prior to development of outcome to identify which participants developed outcomes of interest 1 9.1  User study Usability testing Evaluated overall quality of system in terms of users’ performance and satisfaction (ie, summative usability evaluation) 5 45.5 Requirements gathering Evaluated system to make improvements in design prior to release (ie, formative usability evaluation) 1 9.1 Open in new tab DISCUSSION Our systematic review provided an overview of the current development and application of mHealth technologies targeting diabetes and hypertension. We found a lack of research examining the effects of mHealth interventions on patients’ self-management of diabetes and hypertension. Among the 11 studies identified, only 5 (45.5%) were clinical intervention studies examining the effects of mHealth technologies on patient health outcomes; the rest (n = 6; 54.5%) were user studies focused on the development or testing of mHealth technologies. In terms of types of mHealth technologies implemented in the included studies, the most common features supported patients’ self-management activities such as recording data (eg, blood pressure, glucose), keeping track of trends in the data, and taking medications (n = 11; 100%), followed by features supporting clinical decisions, such as assessing data based on established guidelines and thresholds (n = 6; 54.5%), and those supporting shared decision-making, such as producing a summary report and facilitating communication between patients and providers (n = 6; 54.5%). The results of the clinical intervention studies (n = 5) show that mHealth technologies can help patients (a) adhere to supposedly more complex drug and diet regimes (eg, sending reminders when medications should be taken, notifying patients when refills are necessary, and assisting in the creation of medication histories) and (b) control biomarkers such as blood pressure and glucose. Regarding technical development and implementation of mHealth interventions, the user studies (n = 6) showed that patients generally perceive mHealth technologies as easy to use and useful for self-managing their health conditions. However, health care providers tend to have reservations about mHealth technology as a self-management tool, questioning the validity of patient-entered data and noting other unintended adverse effects, such as increased anxiety among patients, liability issues, and disruption of workflow. Although the clinical studies (n = 5) generally reported improved outcomes, our assessments were limited by the variability in study designs and outcome measures. Due to the heterogeneous nature and limited number of studies deemed eligible for inclusion in the effects analysis, we could not conduct a meta-analysis of the effects of mHealth-supported intervention programs. We also note that 2 studies reported nonsignificant or adverse effects of the implementation of mHealth interventions.25,28 Moreover, among these clinical studies, we could not necessarily find information on how these interventions were designed or supported efforts to overcome the complexity of managing both diabetes and hypertension. In other words, managing both conditions may not simply involve managing 2 separate conditions at the same time, but also require the patient’s deeper understanding of the nature of MCC to reduce any negative synergy of the 2 conditions. In this respect, future studies that focus on educating patients about the potential interactions among MCC and minimizing the complexity of managing multiple conditions using mHealth technologies may help improve health outcomes in this population. In addition, we suggest that the effects of such interventions on health outcomes, especially perceptual (eg, depression, satisfaction with the intervention) and behavioral (eg, adherence to medication and measurement schedule) outcomes, should be monitored as a whole at the MCC level rather than at the individual condition level. This is important because patients have to live with all the conditions they have all the time, not 1 at a time. For those living with diabetes and hypertension, for example, it would not always be clear whether the changed depression level over a period is attributable to diabetes, hypertension, or both. As for behavioral outcomes, such as adherence to medications, it is important to help patients comply with their whole medication plan rather than medications for individual conditions. Only 2 of the included studies (18.2%) were RCTs.27,29 We suggest that this represents a limitation, in relation to the meaningful evaluation of the effects of mHealth technology-supported interventions, and that future studies of mHealth interventions could improve the quality of evaluation results by employing an RCT study design. We also note that the nonrandomized nature of the study designs resulted in a relatively high risk of bias in the study results (Figure 2; for more details, see Supplementary Material). Notwithstanding these limitations, our assessment of the narrative review of the included studies suggests that mHealth technology interventions may represent promising areas for future research. The current interventions were intended to enable users to record personal health data, receive useful tips or suggestions to deal with diabetes and hypertension, and facilitate communication between patients and their providers. Further investigation of the implementation of these technologies using robust study designs that minimize the risk of bias is needed. Future evaluations should carefully consider the outcome measures that they report to ensure they are likely to be of relevance to key stakeholders. Ideally, these outcome sets should include objectively measured patient health outcomes and adverse events to allow a full appraisal of the effects of the intervention being investigated. Lastly, considering the inevitably unique and complex nature of self–managing-specific MCC, future research could focus first on diseases that are pathologically similar and often co-occur (eg, diabetes and hypertension). Then, we could gradually target concurrent diseases that are pathologically different (eg, diabetes and arthritis). Once more solid evidence has accumulated, a universal mHealth app that allows patients to self-manage as many and as varied chronic conditions as they want could be developed. CONCLUSION Future research with more randomized clinical trials is necessary to better understand the potential health benefits of mHealth technologies as assistive tools to facilitate the self-management of the highly prevalent comorbidity of chronic conditions, such as diabetes and hypertension. FUNDING This research received no specific grant from any funding agency in the public, commercial, or nonprofit sectors. AUTHOR CONTRIBUTIONS WC designed the search strategy and data collection instruments; reviewed the identified titles, abstracts, and full text (when needed) for inclusion in the review; completed the data collection process; carried out the analyses; and produced the initial manuscript. SW contributed to the development of the study protocol; reviewed the titles, abstracts, and selected articles identified during the database searches to identify relevant studies for inclusion in the review; and contributed to the drafting of the initial manuscript. YL helped prepare the review protocol; reviewed the full text of included articles to extract key information against the review protocol; conducted the risk-of-bias assessment; and critically reviewed and revised the manuscript for important intellectual content. HO reviewed the full text of included studies to extract key information against the review protocol, especially the clinical aspects of the interventions and associated outcomes; conducted the risk-of-bias assessment; and critically reviewed and revised the manuscript for important intellectual content. ZZ reviewed the full text of included articles to extract information against the review protocol, especially the technical specifications of the mHealth technologies and associated outcomes; and critically reviewed and revised the manuscript for important intellectual content. All authors reviewed and approved the manuscript before submission. SUPPLEMENTARY MATERIAL Supplementary material is available at Journal of the American Medical Informatics Association online. CONFLICT OF INTEREST None to declare. REFERENCES 1 Medical Subject Headings (MeSH). Chronic disease. https://www.ncbi.nlm.nih.gov/mesh/68002908. Accessed April 1, 2020. 2 Centers for Disease Control Prevention. 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Journal of the American Medical Informatics AssociationOxford University Press

Published: Jun 1, 2020

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