(Circulation. 1996;94:2441-2446.)
© 1996 American Heart Association, Inc.
Articles |
Evolution of Early TIMI 2 Flow After Thrombolysis for Acute Myocardial Infarction
George Washington University, Washington, DC (J.S.R., C.F.L., K.C., S.C., S.R., M.T., A.M.R.); Vancouver (BC) General Hospital (A.F.); Mother Francis Hospital, Tyler, Tex (N.I.); Mt Clemens (Mich) General Hospital (J.K.); St Vincents Hospital, Jacksonville, Fla (G.P.); University Community Hospital, Tampa, Fla (J.S.); and University Hospital Gasthuisberg, Leuven, Belgium (F. Van de W.).
Correspondence to Jonathan S. Reiner, MD, Division of Cardiology, George Washington University, 2150 Pennsylvania Ave NW, Washington, DC 20037. E-mail jsreiner@gwis2.circ.gwu.edu.
Background Patients with early Thrombolysis in Myocardial Infarction (TIMI) grade 2 flow after thrombolysis appear to have outcomes similar to thrombolytic failures. To evaluate the origin and evolution of early TIMI 2 flow, we examined early and late angiographic and ventriculographic data from the Global Utilization of Streptokinase and TPA for Occluded Arteries (GUSTO-1) angiographic study.
Methods and Results Of the 914 patients with both 90-minute and 5- to 7-day catheterizations, 278 patients had TIMI grade 2 flow at 90 minutes. At follow-up, 188 (67%) had improved to TIMI grade 3 flow. At 90 minutes, patients with TIMI grade 2 flow had greater infarct vessel narrowing and a significantly greater incidence of thrombus than patients with TIMI grade 3 flow. At the 5- to 7-day follow-up, patients whose flow had improved from TIMI grade 2 at 90 minutes to grade 3 flow at follow-up had larger-caliber vessels (minimum luminal diameter, 0.99±0.47 versus 0.84±0.48 mm; P=.03) and a lower incidence of visible thrombus (26% versus 38%, P=.04) than those with persistent TIMI grade 2 flow. These patients also had a higher mean ejection fraction (57.5±14.1% versus 52.8±12.9%, P=.02) and better infarct zone wall motion (-2.1±1.5 versus -2.6±1.3 SD per chord, P=.01) at the 5- to 7-day follow-up. Patients in whom flow improved from TIMI grade 2 at 90 minutes to TIMI grade 3 by 5 to 7 days had significantly better left ventricular function than patients with persistent TIMI grade 0, 1, or 2 flow and constituted a group whose left ventricular function was intermediate between those who had no reperfusion (TIMI grades 0 and 1) and those whose reperfusion was complete (TIMI grade 3).
Conclusions These data suggest that incomplete clot lysis plays a significant role in the pathogenesis of TIMI grade 2 flow. Furthermore, early TIMI grade 2 flow may be sufficient to provide prolonged myocyte viability, which will further recover if flow normalizes.
Key Words: myocardial infarction • thrombolysis • ventricles
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