Table 1.

Characteristics of the study population

Characteristics	Patients without atrial fibrillation (n=788)	Patients with atrial fibrillation (n=259)
Age, years (median and IQR)	61.9 [53.8; 68.9]	71.2 [62.7 – 76.0]
Female sex	261 (33.1%)	79 (30.1%)
Year of surgery	2010 [2007; 2013]	2010 [2008; 2012]
Chronic obstructive pulmonary disease	116 (14.7%)	60 (23.2%)
Coronary artery bypass graft surgery	566 (71.8%)	178 (68.7%)
Heart valve surgery	292 (37.1%)	121 (46.7%)
Preoperative medication:
Angiotensin-converting enzyme inhibitor use	105 (13.3%)	51 (19.7%)
Beta-blocker use	620 (78.7%)	215 (83%)
Nonsteroidal anti-inflammatory drug use	13 (1.6%)	11 (4.2%)
Statin use	276 (35%)	92 (35.5%)

Continuous variables are presented as median [IQR, interquartile range], and frequency and percentage for the presentation of categorical variables.