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Table 2 Operative details of the study subjects*.

From: Preoperative ejection fraction as a predictor of survival after coronary artery bypass grafting: comparison with a matched general population

Variables Group 1 (EF > 50%) (n = 8204) Group 2 (EF = 35% -50%) (n = 1717) Group 3 (EF < 35%) (n = 364) P Value
Off-pump (%) 780 (9.5) 101 (5.9) 21 (5.8) < 0.0001
IMA (%) 7378 (89.9) 1494 (87.0) 277 (76.1) < 0.0001
No. anastomoses (mean ± SD) 3.42 ± 1.1 3.5 ± 1.1 3.62 ± 1.1 0.295
Cardioplegia:     
   Crystalloid (%) 2432 (36.4) 479 (38.1) 118 (42.0) < 0.001
   Blood (%) 3299 (49.35) 652 (51.9) 133 (47.3) < 0.001
ECC time (min) (mean ± SD) 56.5 ± 32.7 61.9 ± 31.0 68.0 ± 35.8 < 0.001
Re-exploration (%) 428 (5.2) 119 (6.9) 13(3.6) 0.009
Perioperative MI (%) 240 (2.9) 49 (2.9) 12 (3.3) 0.775
IABP (%) 121 (1.5) 56 (3.3) 30 (8.2) < 0.0001
  1. EF = Ejection fraction, IMA = internal mammary artery, ECC = extracorporeal circulation, MI = myocardial infarction, IABP = intra-aortic balloon pump support.
  2. *Data are represented as the number (%) or mean ± SD.