Circulation. 2001;104:636-641
doi: 10.1161/hc3101.093701
doi: 10.1161/hc3101.093701
(Circulation. 2001;104:636.)
© 2001 American Heart Association, Inc.
Clinical Investigation and Reports |
Normal Flow (TIMI-3) Before Mechanical Reperfusion Therapy Is an Independent Determinant of Survival in Acute Myocardial Infarction
Analysis From the Primary Angioplasty in Myocardial Infarction Trials
From the Cardiovascular Research Foundation, Lenox Hill Heart and Vascular Institute, New York, NY.
Address reprint requests to Gregg W. Stone, MD, The Cardiovascular Research Foundation, 55 E 59th St, 6th Floor, New York, NY 10022. E-mail gstone{at}crf.org
Background—— Whereas survival after lytic therapy for myocardial infarction is strongly dependent on early administration, it is unknown whether the otherwise excellent outcomes in patients undergoing primary PTCA for acute myocardial infarction, in whom TIMI-3 flow rates of >90% may be achieved, can be further improved by early reperfusion.
Methods and Results—— Among 2507 patients enrolled in 4 PAMI trials undergoing primary PTCA, spontaneous reperfusion (TIMI-3 flow) was present in 16% at initial angiography. Compared with patients without TIMI-3 flow, those with TIMI-3 flow before PTCA had greater left ventricular ejection fraction (57±10% versus 53±11%, P=0.003) and were less likely to present in heart failure (7.0% versus 11.6%, P=0.009). Patients with initial TIMI-3 flow had significantly lower in-hospital rates of mortality, new-onset heart failure, and hypotension and had a shorter hospital stay. Cumulative 6-month mortality was 0.5% in patients with initial TIMI-3 flow, 2.8% with TIMI-2 flow, and 4.4% with initial TIMI-0/1 flow (P=0.009). By multivariate analysis, TIMI-3 flow before PTCA was an independent determinant of survival (odds ratio 2.1, P=0.04), even when corrected for by postprocedural TIMI-3 flow.
Conclusions—— Patients undergoing primary PTCA in whom TIMI-3 flow is present before angioplasty present with greater clinical and angiographic evidence of myocardial salvage, are less likely to develop complications related to left ventricular failure, and have improved early and late survival. These data warrant prospective randomized trials of pharmacological strategies to promote early reperfusion before definitive mechanical intervention in acute myocardial infarction.
Key Words: angioplasty • survival • myocardial infarction • reperfusion
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