Table 2.

Operative characteristics of patients undergoing on-pump and off-pump CABG

Characteristics	On-pump group (n=13560)	Off-pump group (n=306)	P value
Emergency surgery	14.1	9.7	0.028
IABP insertion	2.4	0.3	0.020
IMA used as graft	98.8	95.1	<0.001
Number of IMA for graft	1.00±0.15	0.96±0.24	<0.001
Radial artery used as graft	10.6	2.9	<0.001
Anastomoses with venous grafts	98.4	61.8	<0.001
Number of vein for graft	2.54±0.90	0.79±0.78	<0.001
Blood transfusion	20.2	3.6	<0.001

Data are presented as mean ± SD or percentages; CABG: Coronary Artery Bypass Grafting IMA: Internal mammary artery; IABP: Intra-Aortic Balloon Pump