Correlation between template bleeding times and spontaneous bleeding during treatment of acute myocardial infarction with recombinant tissue-type plasminogen activator

Circulation
L W GimpleD Collen

Abstract

The purpose of this study was to correlate bleeding complications during and after treatment with recombinant tissue-type plasminogen activator (rt-PA) with serial template bleeding time measurements, with ADP-induced platelet aggregation, with clinical characteristics, and with hemostatic parameters. Fifty-two of 55 consecutive patients with acute myocardial infarction and template bleeding times (Ivy method) of less than 9.5 minutes were treated with rt-PA in a total dose of 55-212 mg (mean, 109 mg) over 90 to 360 minutes (median, 240 minutes) combined with heparin. The mean bleeding time was significantly prolonged at 90 minutes (from 5.0 +/- 1.9 to 8.2 +/- 4.3 minutes, p less than 0.0001) but returned toward baseline after 4 hours (from a median of 8.0 to 7.0 minutes, p less than 0.05). Thirteen patients (25%) suffered relatively minor but spontaneous bleeding that did not correlate with age, hypertension, smoking, partial thromboplastin time, platelet count, ADP-induced platelet aggregation, steady-state rt-PA level, or extent of fibrinogen degradation. In multivariate analysis, only the 90-minute bleeding time correlated with spontaneous bleeding (p = 0.01). Prolongation of the 90-minute bleeding time to greater than or e...Continue Reading

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