title: Limited prognostic value of noninvasive assessment of reperfusion by continuous vectorcardiography in an unselected cohort of patients with acute ST-elevation myocardial infarction treated with thrombolysis.
abstract: OBJECTIVE
  We studied the prognostic value of different reperfusion criteria of short-term continuous vectorcardiography (VCG) in an unselected cohort of 400 patients with ST-elevation myocardial infarction, treated at 4 coronary care units in Stockholm, Sweden, between 1999 and 2002. The main outcome measure was 1-year mortality.
  
  
  RESULTS
  Of 400 study patients, 41 (10.2%) died within 1 year. One-year mortality in patients without reperfusion at 90 minutes, defined as ST resolution below 50% on VCG, was 11.6% compared with 9.0% in patients with reperfusion, (P = 0.4). Ninety-eight (24.5%) patients underwent intervention before discharge and percutaneous coronary intervention or coronary artery bypass grafting or both during the index admission. Percutaneous coronary intervention or coronary artery bypass grafting was related to improved 1-year survival (97 +/- 2% vs 87 +/- 2%, P = .0076). ST-vector magnitude resolution at 90 minutes was lower in patients who underwent intervention (P = .045). None of the reperfusion criteria of VCG was significantly associated with 1-year mortality.
  
  
  CONCLUSIONS
  Our results show that noninvasive assessment of reperfusion by continuous VCG has limited prognostic value in unselected patients treated with thrombolysis because of ST-elevation myocardial infarction when subsequent revascularizations are performed. However, VCG might be useful in selecting patients for coronary angiography with subsequent revascularization.
authors.affiliation: Department of Cardiology, Karolinska University Hospital, Karolinska Institute, Stockholm, Sweden. michael.eriksson@karolinska.se
authors.forename: Michael
authors.initials: M
authors.lastname: Eriksson
authors.forename: Claes
authors.initials: C
authors.lastname: Hofman-Bang
authors.forename: Hans
authors.initials: H
authors.lastname: Persson
authors.forename: Per
authors.initials: P
authors.lastname: Tornvall
mesh_terms: D000368:Aged; D015331:Cohort Studies; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D009203:Myocardial Infarction / Q000401:mortality* / Q000628:therapy*; D011379:Prognosis; D015424:Reperfusion / Q000401:mortality*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013548:Sweden / Q000453:epidemiology; D015912:Thrombolytic Therapy / Q000401:mortality*; D016896:Treatment Outcome; D014672:Vectorcardiography / Q000379:methods* / Q000706:statistics & numerical data*