Limitations of the SAVI registries are the ones inherent to registries, such as self-reporting of events. However, risk of under-reporting was minimized due to the application of yes/no questions for safety endpoints. Furthermore, data were not monitored, nor adjudicated, no core laboratory was used, and SAVI-1 did not include VARC recommendations [7]. As—due to the nature of a registry—echocardiographic assessment was optional, only slightly more than 50% returned for echocardiographic assessment at 1 year. Furthermore, only rudimentary baseline information was available (e.g. preimplant pacemaker rate was not assessed). Baseline parameters would have been important to gain a better understanding of how the population changed between SAVI-1 and SAVI-2. Lastly, future research should include long-term follow-up.