Table 1.

Modified Risk Index for Atrial Fibrillation after Cardiac Surgery

Predictor	Incidence of Postoperative AF No./Total (%)	Risk Score	OR (95% CI)	P Value
Age, y
< 30	0	0	1.74 (1.58 – 1.92)	<0.001
30–39	2/36 (5.6)	6
40–49	19/229 (8.3)	12
50–59	160/795 (20.1)	18
60–69	378/1145 (33.0)	24
70–79	377/817 (46.1)	30
≥ 80	40/68 (58.8)	36
Medical history
Atrial fibrillation	142/268 (53.0)	7	2.04 (1.52 – 2.75)	<0.001
Chronic obstructive pulmonary disease	137/320 (42.8)	4	1.42 (1.09 – 1.86)	0.010
Concurrent valve surgery	154/286 (53.9)	5	1.67 (1.25 – 2.23)	<0.001
Withdrawal of treatment
Beta-blockers	396/784 (50.5)	7	1.95 (1.55 – 2.46)	<0.001
ACE-I	320/692 (46.2)	5	1.65 (1.34 – 2.02)	<0.001
Preoperative and postoperative treatment
Beta-blockers	228/1289 (17.7)	−7	0.50 (0.39 – 0.62)	<0.001
ACE-I	126/626 (20.1)	−5	0.61 (0.48 – 0.78)	<0.001
Statins	128/665 (19.3)	−5	0.58 (0.46 – 0.74)	<0.001
Postoperative Beta-blockers	51/228 (17.7)	−11	0.32 (0.22 – 0.46)	<0.001
Other treatment
Potassium supplementation	774/2688 (28.8)	−5	0.62 (0.49 – 0.79)	<0.001
NSAIDs	173/934 (18.5)	−7	0.50 (0.41 – 0.62)	<0.001

OR, odds ratio; ACE-I, angiotensin-converting enzyme inhibitor; NSAID, nonsteroidal anti-inflammatory drug.