Table 3 . preoperative characteristics .

	Isolated CABG			CABG + Valve surgery			Isolated Valve surgery			Other cardiac operations
	AF (n=128)	No AF (n=879)	P	AF (n=10)	No AF (n=38)	P	AF (n=27)	No AF (n=105)	P	AF (n=6)	No AF (n=61)	P
Age (mean+SD)	63.1±8.9	58.7±10.5	0.000	58.8±8.7	58.9±9.9	0.966	49.8±12.3	35.9±18.7	0.000	37.3±21.2	20.6±19.0	0.831
Female gender	37(28.9)	229(26.1)	0.279	3(30.0)	14(36.8)	0.497	12(44.4)	55(52.4)	0.302	3(50.0)	37(61.7)	0.443
Angina class>III	3(2.4)	35(3.8)	0.264	0	3(7.9)	0.488	0	6(6.0)	0.281	2(33.3)	0	0.009
NYHA≥III	69(55.6)	427(49.6)	0.122	6(60)	27(71.1)	0.377	11(47.8)	49(49.5)	0.535	3(50.0)	9(17.3)	0.096
Recent MI	47(36.7)	274(31.2)	0.124	4(40.0)	8(21.1)	0.202	0	1(1.0)	0.795	0	1(1.6)	0.910
Current smoker	45(35.2)	403(45.8)	0.014	3(30.0)	17(44.7)	0.320	5(18.5)	26(24.8)	0.343	0	5(8.2)	0.616
Diabetes	32(25.0)	212(24.1)	0.452	1(10.0)	4(10.5)	0.724	1(3.7)	4(3.8)	0.729	0	3(4.9)	0.751
HTN	15(11.7)	74(8.4)	0.145	0	1(2.6)	0.792	3(11.1)	5(4.8)	0.208	1(16.7)	1(1.6)	0.172
COPD	15(11.7)	119(13.5)	0.343	3(30.0)	0	0.007	1(3.7)	14(13.3)	0.141	0	3(4.9)	0.751
CVA	6(4.7)	22(2.5)	0.134	0	3(7.9)	0.488	1(3.7)	5(4.8)	0.644	0	0	-
PVD	2(1.6)	4(0.5)	0.171	0	1(2.6)	0.792	0	2(1.9)	0.632	1(16.7)	0	0.090
Renal dysfunction	13(10.2)	78(9.0)	0.369	4(40.0)	3(7.9)	0.027	3(11.1)	8(7.7)	0.404	1(16.7)	4(6.6)	0.252
Prior surgery	0	10(1.1)	0.255	0	2(5.3)	0.623	1(3.7)	9(8.6)	0.352	1(16.7)	1(11.1)	0.384
Drug history	115(89.8)	793(90.2)	0.498	10(100)	36(94.7)	0.623	21(77.8)	69(65.7)	0.167	2(33.3)	20(32.8)	0.649
MI: Myocardial Infarction; PVD: Peripheral Vascular Disease; AF: Atrial Fibrillation; CVA: Cerebrovascular Accident; HTN:Hypertension≥140/90; Other cardiac operations consist surgery for congenital heart disease (n=55), Pericardial Cyst (n=2), Aneurysm (n=4), Aortic Dissection (n=3).