title: Abnormal coronary flow in infarct arteries 1 year after myocardial infarction is predicted at 4 weeks by corrected Thrombolysis in Myocardial Infarction (TIMI) frame count and stenosis severity.
abstract: Because 24% to 30% of patent infarct-related arteries occlude in the year following thrombolytic therapy for acute myocardial infarction, angiographic factors including corrected Thrombolysis in Myocardial Infarction (TIMI) frame count which may predict abnormal infarct-artery flow, require definition. We examined changes in coronary flow and infarct-artery lesion severity by computerized quantitative angiography over 1 year in 154 patients with a patent infarct-related artery 4 weeks after myocardial infarction. These patients were randomized to receive either ongoing daily therapy of 50 mg aspirin and 400 mg dipyridamole, or placebo. All angiograms were interpreted blind in our core angiographic laboratory. Infarct-artery flow, assessed by corrected TIMI frame counts, was normal (< or = 27) in 46% and 45% of patients at 4 weeks and 1 year, respectively. At 4 weeks, patients with corrected TIMI frame counts < or = 27 had higher ejection fractions (60+/-11% vs 56+/-12%; p = 0.04) than those with corrected TIMI frame counts >27. On multivariate analysis, corrected TIMI frame count and stenosis severity were predictive of late abnormal infarct-artery flow (TIMI 0 to 2 flow, both p <0.01). Only stenosis severity at 4 weeks predicted reocclusion at 1 year (p <0.0001). Aspirin and dipyridamole had no effect on flow or reocclusion. Thus, corrected TIMI frame count and stenosis severity at 4 weeks was highly correlated with infarct-artery flow at 1 year.
authors.affiliation: Department of Cardiology, Green Lane Hospital, Epsom, Auckland, New Zealand.
authors.forename: J K
authors.initials: JK
authors.lastname: French
authors.forename: C J
authors.initials: CJ
authors.lastname: Ellis
authors.forename: B J
authors.initials: BJ
authors.lastname: Webber
authors.forename: B F
authors.initials: BF
authors.lastname: Williams
authors.forename: D J
authors.initials: DJ
authors.lastname: Amos
authors.forename: K
authors.initials: K
authors.lastname: Ramanathan
authors.forename: R M
authors.initials: RM
authors.lastname: Whitlock
authors.forename: H D
authors.initials: HD
authors.lastname: White
mesh_terms: D000368:Aged; D015986:Confounding Factors, Epidemiologic; D017023:Coronary Angiography; D003326:Coronary Circulation; D003327:Coronary Disease / Q000000981:diagnostic imaging / Q000503:physiopathology*; D018450:Disease Progression; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009203:Myocardial Infarction / Q000188:drug therapy / Q000503:physiopathology*; D011237:Predictive Value of Tests; D012008:Recurrence; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D015912:Thrombolytic Therapy; D014654:Vascular Patency