Objective: To establish a classification of bicuspid aortic valve (BAV) that includes both leaflet morphology and aortic shape. Setting: Two academic medical centres of the University of Washington, Seattle. Patients: 191 adult patients with BAV. Interventions: Review of clinical data and transthoracic echocardiograms. Main outcome measures: Assessment of leaflet morphology; valve function; aortic shape and dimensions. Results: We identified three morphologies: type 1, fusion of right and…