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European Journal of Cardio-Thoracic Surgery, Vol 11, 848-856, Copyright © 1997 by European Association for Cardio-thoracic Surgery

ARTICLES

Early and late outcome after CABG in patients with evolving myocardial infarction

P Sergeant, E Blackstone and B Meyns
Cardiac Surgery Department, Gasthuisberg University Hospital Leuven, Belgium. Paul.Sergeant@uz.kuleuven.ac.be

OBJECTIVE: To study the determinants of early and late outcome after coronary artery bypass grafting (CABG) for evolving myocardial infarction. METHOD: 269 consecutive patients underwent isolated primary or repeat CABG from 1971 to 1992 for evolving myocardial infarction. By institutional policy, these were patients, strictly diagnosed, infarcting either in the cardiac cateterization laboratory, shortly after a previous CABG, or on cardiac intervention waiting lists. At operation, 125 patients were hemodynamically stable, 89 patients in cardiogenic shock 55 patients in cardiopulmonary resuscitation (CPR). Interval between infarct onset and surgical reperfusion ranged from 53 min to 15 h (median, 135 min; 90% between 75 and 360). An internal mammary artery graft (IMA) was used in 81 patients. Cross-sectional follow-up was 100% complete and multivariable analysis was conducted in the hazard function domain. RESULT: One-month, 1-year and 10-year survival was 86, 84 and 66%, respectively. The 1-year and 10-year survival, stratified by hemodynamic class, was respectively 98 and 77% for the stable patients, 77 and 60% for the patients in shock and 62 and 49% for those undergoing CPR. Shock and CPR were incremental risk factors for early but not late risk. Use of an IMA graft was not a risk factor early or late in either stable or unstable patients. CONCLUSION: CABG can be performed with acceptable early and long-term risk in selected patients with evolving myocardial infarction, whatever their hemodynamic state. Outcome as regards survival is neither adversely or advantageously affected by choice of bypassing conduit. An evolving myocardial infarction with stable hemodynamics carries a lesser risk than an unstable anginal state with changing ST-segment.

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