label: Velocity-time integral.pulmonary vein A wave/Velocity-time integral.mitral valve A wave &#x7C; Pulmonary vein+Mitral valve &#x7C; Cardiac ultrasound
label_lc: velocity-time integral.pulmonary vein a wave/velocity-time integral.mitral valve a wave &#x7c; pulmonary vein+mitral valve &#x7c; cardiac ultrasound