title: Clinical and angiographic correlates and outcomes of suboptimal coronary flow inpatients with acute myocardial infarction undergoing primary percutaneous coronary intervention.
abstract: OBJECTIVE
  The purpose of this study was to determine the clinical and angiographic correlates and outcomes of patients with suboptimal coronary flow after primary percutaneous coronary interventions (PCI).
  
  
  BACKGROUND
  The clinical and angiographic correlates and outcomes of Thrombolysis in Myocardial Infarction (TIMI) < or =2 flow in patients treated with primary PCI are not known.
  
  
  METHODS
  We evaluated 3,362 patients with ST elevation myocardial infarction enrolled in various Primary Angioplasty in Myocardial Infarction trials, who underwent primary PCI.
  
  
  RESULTS
  Post-procedural final TIMI < or =2 flow occurred in 232 (6.9%) patients. Multivariate analysis identified age > or =70 years (odds ratio [OR], 1.6; 95% confidence interval [CI], 1.1 to 2.2), diabetes (OR 1.9; 95% CI, 1.3 to 2.7), symptom onset to emergency room presentation (OR 1.1; 95% CI, 1.1 to 1.2); initial TIMI < or =1 flow (OR 3.2; 95% CI, 1.9 to 5.5), and left ventricular ejection fraction <50% (OR 1.7; 95% CI, 1.2 to 2.4) as independent correlates of final TIMI < or =2 flow. In-hospital (composite of reinfarction, ischemic target vessel revascularization, or death, as well as these events individually) and one-year (reinfarction and/or death) events occurred more frequently in patients with TIMI < or =2 flow. The Cox proportional hazards model identified TIMI < or =2 flow to be independently associated with one-year mortality (hazard ratio 3.8, 95% CI, 2.5 to 5.7).
  
  
  CONCLUSIONS
  Final TIMI < or =2 flow, although uncommon after primary PCI, was strongly associated with hospital and one-year adverse events. The clustering of final TIMI < or =2 flow in high-risk groups may partially explain the poor prognosis of these patients. Awareness of these risk factors may be useful to clinicians to triage and treat patients undergoing primary PCI.
authors.affiliation: University of Michigan, Ann Arbor, Michigan, USA.
authors.forename: Rajendra H
authors.initials: RH
authors.lastname: Mehta
authors.forename: Kishore J
authors.initials: KJ
authors.lastname: Harjai
authors.forename: David
authors.initials: D
authors.lastname: Cox
authors.forename: Gregg W
authors.initials: GW
authors.lastname: Stone
authors.forename: Bruce
authors.initials: B
authors.lastname: Brodie
authors.forename: Judy
authors.initials: J
authors.lastname: Boura
authors.forename: William
authors.initials: W
authors.lastname: O'Neill
authors.forename: Cindy L
authors.initials: CL
authors.lastname: Grines
mesh_terms: D000368:Aged; D015906:Angioplasty, Balloon, Coronary / Q000009:adverse effects*; D015331:Cohort Studies; D017023:Coronary Angiography; D003326:Coronary Circulation / Q000502:physiology*; D003331:Coronary Vessels / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000628:therapy*; D011183:Postoperative Complications / Q000209:etiology*; D011446:Prospective Studies; D015607:Stents; D015912:Thrombolytic Therapy / Q000379:methods; D016896:Treatment Outcome