Introduction: Little is known about the early and late performance of the 31mm CoreValve Revalving System (CRS, Medtronic Inc., Galway, Ireland). Our aim was to compare acute and long-term results of the 31mm CRS with other valve sizes.
Methods: Consecutive patients undergoing transcatheter aortic valve implantation (TAVI) with CRS in nine Italian centers were prospectively included and dichotomized according to prosthesis size in two different groups, as follows: 31mm and other valve sizes (i.e., 23, 26, and 29mm combined). End points were defined according to Valve Academic Research Consortium definitions. Propensity score matching was performed.
Results: In total, 2069 patients (n=169 [8%] in the 31mm group and n=1900 [92%] in the other valve sizes group) were included. After propensity matching, the implantation of the 31mm valve was associated with lower rates of procedural- (91.3% vs. 98.1%, p=0.030) and device-success (88.5% vs. 97.1%, p=0.016), longer procedural time (120 [80-180] min. vs. 90 [60-120] min., p<0.001), and higher rates of implantation of a second valve (10.6% vs. 2.9%, respectively, p=0.027). The rates of permanent pacemaker implantation in the 31mm group were higher but not statistically different from other valve sizes (41.7% vs. 30.9%, respectively, p=0.149). Significant improvement, without between-group differences, was observed in NYHA functional class. Cardiovascular death was lower in the 31mm valve group through 2-years (3.8% vs. 13.5%, respectively, p=0.014).
Conclusions: The acute performance of the 31mm CRS was worse than other valve sizes but no negative impact was observed in long-term outcomes.
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