label: Velocity-time integral.pulmonary vein A wave/Velocity-time integral.mitral valve A wave:LenRto:Pt:Pulmonary vein+Mitral valve:Qn:US
label_lc: velocity-time integral.pulmonary vein a wave/velocity-time integral.mitral valve a wave:lenrto:pt:pulmonary vein+mitral valve:qn:us