Association Between Renal Function, Diastolic Dysfunction, and Postoperative Atrial Fibrillation Following Cardiac Surgery

• Published in: Circulation Journal Vol. 77; no. 9; pp. 2303 - 2310
• Main Authors: Chua, Su-Kiat, Shyu, Kou-Gi, Lu, Ming-Jen, Hung, Huei-Fong, Cheng, Jun-Jack, Lee, Shih-Huang, Lin, Chia-Hsun, Chao, Hung-Hsing, Lo, Huey-Ming
• Format: Journal Article
• Language: English
• Published: Japan The Japanese Circulation Society 2013
• Subjects: Atrial fibrillation; Coronary artery bypass graft; Renal function
• ISSN: 1346-9843; 1347-4820
• DOI: 10.1253/circj.CJ-13-0273

Background: Renal dysfunction is associated with a higher rate of atrial fibrillation in clinical practice. This study investigated the associations between renal function, left ventricular (LV) diastolic dysfunction, and postoperative atrial fibrillation (POAF). Methods and Results: A total of 265 consecutive patients who underwent cardiac surgery were prospectively enrolled in the study. Echocardiography was performed before cardiac surgery. The patients were divided into 3 groups based on estimated glomerular filtration rate (eGFR) (group 1, ≥90ml·min–1·1.73m–2; group 2, 60–90ml·min–1·1.73m–2; and group 3, <60ml·min–1·1.73m–2). POAF occurred in 83 of 265 patients (31.3%). The rate of new-onset POAF increased from 15.2% (12/79) in group 1 to 27.8% (27/97) in group 2 and 49.4% (44/89) in group 3 (P<0.001). Further, with increasing renal dysfunction from groups 1 to 3, the rate of LV diastolic dysfunction – defined as E/e’ >15 – also increased (group 1, 19.0%; group 2, 38.1%; and group 3, 48.3%; P<0.001). Absolute eGFR was significantly correlated with E/e’ ratio (r=−0.39, P<0.001). Renal function remained as the independent predictor of POAF on multivariate analysis (odds ratio, 1.90; 95% confidence interval: 1.26–2.87; P=0.002). Conclusions: In patients undergoing cardiac surgery, decreased eGFR was associated with an increased rate of LV diastolic dysfunction with a subsequent increase in the rate of POAF.  (Circ J 2013; 77: 2303–2310)