[Late results of CABG for postinfarction angina--relation to preoperative myocardial infarct size]

We evaluated the late results of coronary bypass grafting (CABG) in 85 patients. The patients were divided into two groups according to preoperative MI size estimated by the Selvester QRS score; 24 with MI size of larger than 20% of LV muscle (group A; average 28 +/- 11%), and 61 with MI size smaller than 20% (group B; average 10 +/- 9%). New York Heart Association classes of both groups following CABG improved significantly (from 2.8 +/- 0.7 to 1.3 +/- 0.4 in group A; p less than 0.01, from 2.5 +/- 0.6 to 1.2 +/- 0.5 in group B; p less than 0.01). There was higher incidence of serious ventricular arrhythmias in group A than in group B (83% vs. 21%, p less than 0.01). In Group A, LVEF and LVESVI did not improve following CABG (from 17 +/- 9 to 16 +/- 8 mmHg, from 39 +/- 15 to 40 +/- 15%, from 66 +/- 28 to 69 +/- 40 ml/M2), while in Group B, those improved significantly (from 13 +/- 6 to 11 +/- 5 mmHg; p less than 0.01, from 53 +/- 14 to 58 +/- 10%; p less than 0.01, from 39 +/- 23 to 32 +/- 14 ml/M2; p less than 0.05). The exercise-to-rest LVSWI ratios increased significantly following CABG in both groups (from 86 +/- 25 to 160 +/- 56% in group A; p less than 0.05, from 92 +/- 31 to 140 +/- 37% in group B; p less than 0.05).(ABSTRACT TRUNCATED AT 250 WORDS)