Figure 1. Predictive factors for postoperative atrial fibrillation (POAF) of coronary artery bypass grafting. Knot 1: size of left atrium (40.5mm) was the best variable to identify patient who developed POAF. Knot 2: the diagnosis of arterial hypertension identified patients with and without POAF when the size of the left atrium was smaller than 40.5mm. Knot 5: age identified patients who developed POAF when size of left atrium was >40.5mm.

SBH: Systemic blood hypertension; POAF: postoperative atrial fibrillation.