title: Is new ST-segment elevation after coronary artery bypass of clinical importance in the absence of perioperative myocardial infarction?
abstract: OBJECTIVE
  To determine the frequency and significance of new ST-segment elevation during the early postoperative period after coronary artery bypass grafting (CABG) in patients without enzymatic or electrocardiogram evidence of perioperative myocardial infarction (MI).
  
  
  METHODS
  Pre- and early postoperative electrocardiograms were reviewed in 506 patients undergoing CABG in whom MI was excluded by the absence of new Q waves or left bundle branch block and a peak postoperative troponin I less than 10 ng/mL.
  
  
  RESULTS
  New ST-segment elevation of 0.1 mV or greater was observed in 64 patients (12.6%). Patients with and without ST-segment elevation did not differ with regard to age, prior coronary artery bypass, number of grafts, use of the internal mammary artery, incidence of postoperative atrial fibrillation, length of stay in the intensive care unit, duration of hospitalization, or 30-day mortality.
  
  
  CONCLUSIONS
  ST-segment elevation not due to perioperative MI is common after CABG but is not associated with increased postoperative morbidity or mortality.
authors.affiliation: Edward Hines Jr. Veterans Administration Hospital, Hines, IL 60141, USA. hsl4134@yahoo.com
authors.forename: Henry S
authors.initials: HS
authors.lastname: Loeb
authors.forename: William P
authors.initials: WP
authors.lastname: Gunnar
authors.forename: Donald D
authors.initials: DD
authors.lastname: Thomas
mesh_terms: D000368:Aged; D001281:Atrial Fibrillation / Q000175:diagnosis / Q000401:mortality* / Q000517:prevention & control; D001026:Coronary Artery Bypass / Q000401:mortality*; D004562:Electrocardiography / Q000706:statistics & numerical data; D005260:Female; D006801:Humans; D007087:Illinois / Q000453:epidemiology; D015994:Incidence; D007902:Length of Stay / Q000706:statistics & numerical data*; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000175:diagnosis / Q000401:mortality* / Q000601:surgery*; D019990:Perioperative Care / Q000706:statistics & numerical data; D018570:Risk Assessment / Q000379:methods*; D012307:Risk Factors; D016019:Survival Analysis; D015996:Survival Rate