Table 2. Predisposing factors and rates of postoperative atrial fibrillation in OPCAB patients .

Variable	OPCAB with AF (n=38)	OPCAB without AF (n=345)	P -value
Female gender	8 (21.1)	93 (27.0)	0.283
Age >65	16 (42.1)	83 (24.1)	0.016
Hypertension	6 (15.8)	42 (121.2)	0.336
Not receiving Beta-blocker	6 (15.8)	64 (18.6)	0.437
Not receiving CC.Blocker	23 (60.5)	228 (66.1)	0.303
ICU stay (day, min±SD)	4.2±2.9	3.3±2.3	0.023
Hospital stay (day, min±SD)	8.0±3.9	7.1±3.2	0.122
In-hospital mortality	0 (0)	5 (1.4)	0.591

AF=Atrial Fibrillation; CC.Blocker= Calcium Cchannel Blocker; ICU=Intensive Care Unit; OPCAB= Off-pump Coronary Artery Bypass Grafting; SD=Standard Deviation