Rusinaru D, et al. - In patients with severe aortic stenosis (AS) and preserved left ventricular ejection fraction (LVEF), low flow (LF) is currently defined using Doppler-echocardiography by a stroke volume index (SVi)<35 mL/m². Herein, the link between LF and mortality in severe AS was analyzed in order to establish prognostic LF values related to mortality risk. In severe AS with preserved LVEF under medical and surgical management, low flow defined as SVi < 30 mL/m² or SV < 55 mL was identified as an essential outcome predictor.