Echocardiography Valvuloarterial impedance (Zva): Global left ventricular afterload in aortic stenosis Johnson Francis | February 26, 2021 Valvuloarterial impedance (Zva): Global left ventricular afterload in aortic stenosis Valvuloarterial impedance (Zva) is an echocardiographic measure of global left ventricular afterload in aortic stenosis [1]. It accounts Read More