An alternative subcoronary implantation technique decreases the risk of complete heart block after stentless aortic valve replacement

Context: Stentless aortic valve prostheses have excellent hemodynamic profiles, but may be associated with an increased postoperative heart block when compared to conventional prostheses. Aims: To assess the effect of an alternative subcoronary implantation technique on postoperative complete heart block (CHB) and permanent pacemaker implantation (PPI) following aortic valve replacement (AVR) with stentless tissue valves. Settings and Design: Atotal of 130 consecutive patients undergoing AVR with stentless tissue valves by a single surgeon were studied retrospectively. Materials and Methods: A stentless tissue valve was implanted into 80 patients using the conventional modified subcoronary implantation technique, and 50 patients received a stentless tissue valve by an alternative subcoronary technique in which the inflow suture line is raised at the level of right-non coronary commissure. Data were collected at the time of hospital discharge and at 6-12 months postoperatively. Statistical Analysis Used: Independent samples t-testwasusedto compare continuous variables, and categorical variables were compared with the chi-square test. Results: Use ofthis new method reduced postoperative CHB (4.0% vs. 16.3%, P = 0.033), with fewer patients requiring PPI in the early postoperative period (6.0% vs. 18.8%, P = 0.041). Echocardiographic examination showedno differences in the effective orifice area, peakandmean aortic valve gradients, or leftventricularmass index betweengroups. Trivial or mild aortic regurgitation was foundin3.9% ofpatients with the conventional modified technique and 4.0% of patients undergoing the alternative technique, during follow-up (P > 0.05). Conclusions: Compared to the conventional subcoronary implantation technique, the alternative subcoronary implantation technique reduces the incidence of new CHB and the requirement of PPI following AVR with stentless tissue valves while preserving mid-term hemodynamic fonction.