Aim of this study is to identify clinical, electrocardiographic (ECG) and procedural predictors for permanent pacemaker (PPM) requirement after transaortic valve implantation (TAVI). METHODS: All consecutive patients with severe symptomatic aortic stenosis (SSAS) undergoing TAVI at our single centre were included in the study and prospectively followed. All patients had standard 12-leads ECGs recordings before and after TAVI and continuous ECG monitoring during hospital stay. Primary endpoint was to identify electrocardiographic predictors of PPM implantation after TAVI; secondary endpoint was to ascertain other clinical or procedure-related predictive factors of PPM need. PPM implantation was further arbitrarily divided into early and late one (beyond the 3rd day). RESULTS: Among the 431 patients undergoing TAVI between 2008 and 2018, 77 (18%) needed PPM implantation; 47 (11%) had an early procedure, and 30 (7%) a late implant. Pre-operative RBBB implies more than five-fold increase of the risk of PPM implantation (OR 5.19, CI 1.99 - 13.56, P=0.001), whereas the use of a selfexpandable prosthesis is associated with an almost three-fold increase of the risk (OR 2.60, CI 1.28 - 5.28, P=0.008). In the late PPM implantation subgroup, only the history of syncope retains a significant association with such an increased risk (OR 2.71, CI 1.09 - 6.75, P=0.032). CONCLUSIONS: The need of a PPM in the individual TAVI patient is hardly predictable. However, the finding of pre-existing RBBB, the use of self-expandable prosthesis and history of syncope can individuate patients at increased risk
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