Fig. 3

a Leaflet morphology. Leaflet morphology ascertained from TEE and/or surgical reports. The most common morphology was trileaflet (62.9%), followed by bicuspid (33.3%), unicuspid (0.6%) and quadricuspid (0.3%). In 2.9% of patients, the number of leaflets could not be determined. b AS classification, N = 974 Hemodynamics (gradient, flow and severity) for patients with any degree of AS. The most common category was HG-severe AS (49.9%), and the least common was reverse area-gradient mismatch (2.7%)