Circulation, Vol 87, 38-52, Copyright © 1993 by American Heart Association
BACKGROUND. The early effects of tissue-type plasminogen activator (t- PA)
on the "culprit" coronary lesion in patients presenting with unstable
angina or non-Q wave myocardial infarction were determined by quantitative
arteriography. METHODS AND RESULTS. Of 391 such patients, 306 satisfied
clinical and arteriographic requirements for eligibility and received a
90-minute front-loaded infusion of t-PA (0.8 mg/kg i.v.; maximum, 80 mg) or
placebo plus conventional antianginal therapy. All patients received full
heparinization and a follow-up arteriogram 18-48 hours after treatment. A
non-Q wave myocardial infarction (MI) was diagnosed in 97 patients (32%)
after entry. In the entire patient population, among t-PA- and
placebo-treated patients, respectively, 25% versus 19% (p = 0.25) of all
culprit lesions achieved the primary study end point, measurable
improvement (by > or = 10% reduction of stenosis or two Thrombolysis in
Myocardial Infarction [TIMI] flow grades) at follow-up. Substantial
improvement (by > or = 20% reduction of stenosis or two TIMI grades) was
seen with t-PA in 15% of all culprit lesions versus 5% with placebo (p <
0.003). Arteriographically apparent thrombus was present at baseline in the
culprit lesion of 107 patients (35%). Substantial improvement was more
frequent with t-PA among lesions containing apparent thrombus (in 36% with
t-PA versus 15% with placebo; p < 0.01), as it was among patients
evolving a non-Q wave MI (33% versus 8%; p < 0.005). By multivariate
analysis, the significant, independent predictors of substantial
improvement include apparent thrombus (p = 0.0001), non-Q wave MI (p =
0.003), and t-PA use (p = 0.01). Both non-Q wave MI status and thrombus had
been specified a priori as important variables. CONCLUSIONS.
Arteriographically apparent intraluminal thrombus and improvement of the
culprit lesion with either of these regimens were only moderately frequent
in patients with unstable angina or non-Q wave MI. Substantial improvement
of culprit lesions was more frequent with t-PA than with placebo overall
and in two prospectively defined subgroups. The clinical relevance of these
observations is being tested in the larger, ongoing clinical TIMI IIIB
study.
ARTICLES
Early effects of tissue-type plasminogen activator added to conventional therapy on the culprit coronary lesion in patients presenting with ischemic cardiac pain at rest. Results of the Thrombolysis in Myocardial Ischemia (TIMI IIIA) Trial
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