Table 4.

Postoperative adverse events

Outcome (% unless otherwise indicated)	BIMA	Single IMA
	n = 1,977	n = 14,387	pvalue
Mortality	1.0	1.8	0.009
De-novo atrial fibrillation	15.6	23.3	<0.0001
Re-exploration for bleeding	3.7	3.7	0.96
De-novo renal failure*	3.9	7.0	<0.0001
Stroke	0.8	1.7	0.003
Deep sternal wound infection	2.4	1.2	<0.0001
Mechanical ventilation > 48 hours	1.8	2.8	0.01
Blood product transfusion	42.2	48.5	<0.0001
Mean hospital length of stay (days)	5	6	0.01

*Defined as a 50-μmol/L absolute rise in baseline serum creatinine or a new need for dialysis.

BIMA bilateral internal mammary arteries.