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H. Geschwind, E. Aptecar, G. Boussignac, J. Dubois-Randé, R. Zelinsky, G. Poirot, T. Tomaru (1991)
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Excimer lasers are being extensively used for coronary angioplasty along with multifiber over‐the‐wire catheters. To determine whether another wavelength could be an alternative, the laser‐tissue interaction and the clinical usefulness of an infrared laser were studied. The laser consisted of a Holmium YAG pulsed laser coupled into a multifiber catheter. Experimental data from our laboratory showed that this solid stale laser had the ability to cut calcified tissue, to be preferentially absorbed by atheroma, and to ablate tissue even when the catheter tip was positioned at a distance from the target. These results were obtained with only minimal thermal effects. After assessment of the efficacy and safety of this technique, laser angioplasty was performed in 53 consecutive patients with totally occluded (40%) or stenosed (mean percent 94) coronary arteries with a mean length of 6 mm. The primary laser and the procedure success rate were 64% and 94%, respectively. Failures were due to inability to advance the catheter against the lesion or to cross the obstruction. Stand‐alone laser therapy could be achieved in only 18% of patients. In previous dilatation failures, laser irradiation allowed for subsequent balloon angioplasty to be successfully performed at a lower inflation pressure than that used in the failed dilatation. Complications included abrupt (during the procedure) and early (within 24 hours) vessel closure in 19% of cases, dissection without hemodynamic consequence in 28% and spasm. Reoccluded arteries could all be recanalized with dilatation. There was no death, myocardial infarction, and no urgent coronary artery bypass surgery (CABG). Thus, infrared laser angioplasty is effective in difficult lesions for dilatation. The results are obtained with a reliable, easy to use and to maintain laser source.
Journal of Interventional Cardiology – Wiley
Published: Sep 1, 1991
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