Single-beat Differentiation Among Left Ventricular Filling Patterns by Pulsed Wave Doppler Echocardiography

We sought to evaluate whether the combination of phantom E wave peak velocity (Ep) to phantom A wave peak velocity (Ap) ratio at the apex (Ep/Ap) and pulsed wave Doppler left ventricular (LV) inflow propagation velocity (LVIPVpw) or the combination of Ep/Ap and Ep/LVIPVpw obtained from the same heartbeat can effectively differentiate LV filling patterns. The study population included 132 patients. They were classified into normal, abnormal relaxation, and pseudonormal/restrictive groups according to the ratio of early to late transmittal filling wave peak velocity (E/A), color M-mode Doppler LV inflow propagation velocity, and E/color M-mode Doppler LV inflow propagation velocity. Standard Doppler parameters of LV filling such as E, A, E/A, and E-wave deceleration time had a bimodal distribution, but LVIPVpw decreased and Ep/LVIPVpw increased progressively with worsening of LV diastolic function (both P < .001). The sensitivity and specificity of combination of Ep/Ap 1 or greater and LVIPVpw less than 77 cm/s or of Ep/Ap 1 or greater and Ep/LVIPVpw greater than 0.87 from the same heartbeat in identifying the pseudonormal/restrictive LV filling pattern were 81% and 95% or 81% and 93%, respectively. In conclusion, with application of range ambiguity phenomenon, it is simple and feasible to differentiate LV filling patterns on the same cardiac cycle by pulsed wave Doppler echocardiography.