Effect of postoperative positive airway pressure on risk of postoperative atrial fibrillation after cardiac surgery in patients with obstructive sleep apnea: a retrospective cohort study

Table 2 Risk of Postoperative Atrial Fibrillation (POAF) in Relation to Postoperative Positive Airway Pressure (PAP) Treatment

	No Postoperative PAP (N = 76)	Postoperative PAP (N = 76)	Unadjusted Hazard Ratio^a (95% CI)	Adjusted Hazard Ratio^b (95% CI)
POAF	49 (64.5%)	37 (48.7%)	0.81 (0.53 – 1.24)	0.93 (0.58 – 1.48)

^aWe treated postoperative PAP use as a time-dependent variable in the Cox regression model. The PAP variable for patients who received postoperative PAP was coded as zero until the start of PAP and as one thereafter
^bAdjusted for age, gender, previous atrial fibrillation, history of cerebrovascular event, history of myocardial infarction, chronic obstructive pulmonary disease, surgery type, cardiopulmonary bypass time, and aortic cross-clamp time