TABLE 1.

Patient demographics, preoperative risk factors, and operative features for all patients undergoing primary, isolated coronary artery bypass grafting operations

Variable	CABG (n = 1589)	OPCAB (n = 404)	P value
Preoperative
Age at operation (y)	82.5 ± 2.4	83.0 ± 2.4	<.001
Female gender	38.6%	42.1%	.11
Peripheral vascular disease	18.9%	19.6%	.40
Stroke	8.3%	11.6%	.03
Diabetes	30.5%	27.2%	.11
Dyslipidemia	73.4%	60.9%	<.001
Hypertension	83.9%	81.2%	.11
NYHA class
Class I	13.2%	6.2%	<.001
Class II	22.3%	22.0%
Class III	43.5%	42.1%
Class IV	21.1%	29.7%
Heart failure	13.5%	18.9%	.20
Atrial fibrillation	10.0%	14.6%	.01
Endocarditis	0.0%	0.0%	N/A
Renal failure	5.8%	7.4%	.14
Renal failure (hemodialysis)	1.0%	1.5%	.28
No. of major arteries with stenosis>50%
1	2.1%	16.2%	<.001
2	13.9%	30.2%
3	84.0%	53.6%
Left main stenosis>50%	38.6%	36.9%	.53
STS PROM (%)	5.7 ± 7.1	6.3 ± 6.9%	.15
Operative
Elective	38.3%	40.3%	.87
Urgent	57.3%	54.7%
Emergency	4.3%	5.0%
Crossclamp time (min)	63.9 ± 23.8	—	—
Bypass time (min)	92.2 ± 34.0	—	—
Total no. of bypass grafts	3.4 ± 0.02	2.2 ± 0.07	<.001
Overall ITA use	82.3%	91.9%	<.001
LITA	81.4%	89.4%
RITA	0.3%	0.0%
Bilateral ITA	0.4%	2.1%
Distal arterial anastomosis (no.)
1	75.7%	84.6%	.01
2	4.6%	6.0%
3	1.2%	0.9%
>4	0.6%	0.4%
Distal vein anastomosis (no.)
0	3.2%	31.1%	<.001
1	10.6%	28.2%
2	39.5%	29.1%
3	33.9%	10.7%
>4	12.8%	0.9%
Radial artery anastomosis (no.)
1	4.1%	4.0%	.14
2	4.1%	0.0%
3	1.2%	0.0%
PRBC transfusion (units)	2.0 ± 1.7	1.6 ± 1.0	.05

CABG, Conventional coronary artery bypass grafting; OPCAB, off-pump coronary artery bypass grafting; NYHA, New York Heart Association; STS, Society of Thoracic Surgery; PROM, predicted risk of mortality ITA, internal thoracic artery; LITA, left internal thoracic artery; RITA, right internal thoracic artery; PRBC, packed red blood cell; N/A, not applicable.