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Does Preoperative Platelet Function Predict Bleeding in Patients Undergoing Off Pump Coronary Artery Bypass Surgery?

Does Preoperative Platelet Function Predict Bleeding in Patients Undergoing Off Pump Coronary... Objective We sought to examine the relationship between preoperative platelet function and perioperative bleeding in patients undergoing CABG. Background There are many ways to measure platelet aggregability. Little is known about their correlations with one another, or with bleeding. Methods We prospectively studied 50 patients undergoing a first isolated off‐pump CABG. Thirty‐four were exposed to a thienopyridine prior to surgery; 16 were not. Preoperative platelet function was measured by VerifyNow®, TEG®, AggreGuide™, Plateletworks®, vasodilator‐stimulated phosphoprotein (VASP) phosphorylation, and light transmission aggregometry. Bleeding was assessed 2 ways: drop from pre‐ to nadir postoperative hematocrit, and chest tube drainage. Correlation coefficients were calculated using Spearman's rank‐order correlation. Results Mean age was 62 years. Patient characteristics and surgical details were similar between the thienopyridine‐exposed and non‐exposed patients. The correlation coefficients between the 4 point‐of‐care platelet function measurements and hematocrit change ranged from −0.2274 to 0.2882. Only Plateletworks® correlated with drop in hematocrit (r = 0.2882, P = 0.0470). The correlation coefficients between each of the 4 point‐of‐care platelet function tests and the chest tube drainage were also poor, ranging from −0.3073 to 0.2272. Both AggreGuide™ (r = −0.3073, P = 0.0317) and VASP (r = −0.3187, P = 0.0272) were weakly but significantly correlated with chest tube drainage. The correlation among the 4 point‐of‐care platelet function measurements was poor, with coefficients ranging from −0.2504 to 0.1968. Conclusions We observed little correlation among 4 platelet function tests, and between those assays and perioperative bleeding defined 2 different ways. Whether any of these assays should be used to guide decision making in individual patients is unclear. (J Interven Cardiol 2015;28:223–232) http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Interventional Cardiology Wiley

Does Preoperative Platelet Function Predict Bleeding in Patients Undergoing Off Pump Coronary Artery Bypass Surgery?

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References (12)

Publisher
Wiley
Copyright
© 2015 Wiley Periodicals, Inc.
ISSN
0896-4327
eISSN
1540-8183
DOI
10.1111/joic.12200
pmid
25991082
Publisher site
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Abstract

Objective We sought to examine the relationship between preoperative platelet function and perioperative bleeding in patients undergoing CABG. Background There are many ways to measure platelet aggregability. Little is known about their correlations with one another, or with bleeding. Methods We prospectively studied 50 patients undergoing a first isolated off‐pump CABG. Thirty‐four were exposed to a thienopyridine prior to surgery; 16 were not. Preoperative platelet function was measured by VerifyNow®, TEG®, AggreGuide™, Plateletworks®, vasodilator‐stimulated phosphoprotein (VASP) phosphorylation, and light transmission aggregometry. Bleeding was assessed 2 ways: drop from pre‐ to nadir postoperative hematocrit, and chest tube drainage. Correlation coefficients were calculated using Spearman's rank‐order correlation. Results Mean age was 62 years. Patient characteristics and surgical details were similar between the thienopyridine‐exposed and non‐exposed patients. The correlation coefficients between the 4 point‐of‐care platelet function measurements and hematocrit change ranged from −0.2274 to 0.2882. Only Plateletworks® correlated with drop in hematocrit (r = 0.2882, P = 0.0470). The correlation coefficients between each of the 4 point‐of‐care platelet function tests and the chest tube drainage were also poor, ranging from −0.3073 to 0.2272. Both AggreGuide™ (r = −0.3073, P = 0.0317) and VASP (r = −0.3187, P = 0.0272) were weakly but significantly correlated with chest tube drainage. The correlation among the 4 point‐of‐care platelet function measurements was poor, with coefficients ranging from −0.2504 to 0.1968. Conclusions We observed little correlation among 4 platelet function tests, and between those assays and perioperative bleeding defined 2 different ways. Whether any of these assays should be used to guide decision making in individual patients is unclear. (J Interven Cardiol 2015;28:223–232)

Journal

Journal of Interventional Cardiology – Wiley

Published: Jun 1, 2015

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