Sutureless aortic valve replacement with Perceval bioprosthesis: are there predicting factors for postoperative pacemaker implantation?

OBJECTIVES: Aortic valve replacement (AVR) with sutureless bioprostheses has become an alternative to conventional AVR for patients with intermediate to high operative risk. However, this technique is associated with an increased risk of postoperative conduction disorders. METHODS: We analysed 258 patients who underwent AVR with the Perceval prosthesis from July 2010 to September 2014 at our centre. Electrocardiography were obtained at baseline to record preoperatively the presence of conduction disorders. Preoperative risk factors, intraoperative procedures and complications (61 variables) were compared between patients with permanent pacemaker (PPM group) and without (no-PPM group) need for postoperative PPM implantation. RESULTS: One hundred and sixty-nine patients underwent isolated AVR with the Perceval bioprosthesis, 89 patients had associated surgery and 23 patients underwent redo operations. The mean age was 77.7 +/- 5 years, 139 patients were female (46%) and the mean logistic EuroSCORE was 13.2 +/- 11%. At baseline, 8 patients had already an implanted pacemaker. Postoperatively, 27 patients (10.5%) required new PPM implantation due to complete atrioventricular block. On univariate analysis, age (PPM vs no-PPM group: 80 +/- 5 vs 77 +/- 5 years, P = 0.009) and preoperative presence of right bundle branch block (RBBB) [overall n = 20 (7.8%); PPM vs no-PPM group: 9 vs 11 (33 vs 4.8%); P < 0.001] were identified as independent predictors of postoperative conduction disorders, but only pre-existing RBBB persisted on multivariate analysis (odds ratio 11.3-C-statistic 0.74, error estimate 0.064, confidence interval 0.672-0.801; P = 0.0002). Among patients undergoing sutureless AVR, the rate of PPM implantation was high. CONCLUSIONS: The analysis of the data collected made it possible to identify preoperatively a subset of patients undergoing sutureless AVR at higher risk of postoperative atrioventricular block. Additional surgical precautions should be implemented to prevent the occurrence of conduction disorders after sutureless AVR.