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Aims Paravalvular leaks (PVL) and conduction disorders requiring permanent pacemaker implantation (PPI) in patients with severe Aortic Valvular Stenosis (SA) undergoing percutaneous aortic valve prosthesis (TAVI) still have a significant and unacceptable incidence for patients at medium and low surgical risk, who represent, with increasing scientific evidence, the prevalent population. The appearance of these complications seems to be related to clinical, anatomical and procedural factors, which influence the decision-making process of the type and size of bioprosthesis to be implanted. Particular attention has been paid to the role of the volume of calcium present at the native aortic valve (VCA) as a predictor of these complications, in order to optimize the percutaneous procedure. The VCA can be quantified using algorithms derived from Multilayer Computed Computed Axial Tomography (MSCT), an examination that has become a pivotal element in the evaluation of the patient's eligibility for TAVI.The aim of our study was to document the pre-procedural added value of VCA in terms of possible containment of adverse events and how much it may affect the choice of the type of bioprosthesis to be implanted. Methods and results 111 patients underwent TAVIs at the Interventional Cardiology Unit of the AOU S. Giovanni di Dio and Ruggi D'Aragona, between 2017 and 2020, subsequently divided into 2 groups: group A (self-expandable bioprosthesis, Medtronic Evolut R or Evolut Pro) and group B (balloon expandable bioprosthesis, Edward Sapien 3).The clinical, electrocardiographic, echocardiographic and anatomical parameters of the enrolled patients were analyzed, and the VCA in the preprocedural phase was quantified for each of them, using an algorithm extracted from the MSCT reading software, OsiriX (OsiriX-MD v.2.8.2 64-bit). A univariate logistic regression analysis was performed for the risk of developing the composite event of significant PVL and IPP.In Group B, no significant variables were found, while in Group A, the VCA (OR: 1.001; 95% CI, 1.000-1.002; p &amp;lt; 0.043) and incomplete left branch block (OR: 5.781; 95% CI, 0.013-32.988; p &amp;lt; 0.048) were significant. Subsequently, these two variables were tested in a multivariate regression model according to which only the VCA emerged as an independent predictor for the composite event (OR: 1.001; 95% CI, 1.000-1.002; p &amp;lt; 0.039). Conclusion VCA is significantly associated with the risk of moderate to severe PVL and rhythm disturbances requiring PPI, in the group of patients in whom a self-expandable bioprosthesis was implanted, unlike patients who received a balloon-expandable bioprosthesis where this association is not significant.

234 The role of preprocedural assessment of aortic valve calcium volume for the optimization of percutaneous aortic bioprosthesis implantation (TAVI)