Three patterns of delayed onset of the tricuspid valve flow. A. Pattern A. Delayed onset of the tricuspid valve (TV) flow with prolonged ejection time (double-headed arrow) of the pulmonary arterial (PA) flow as compared to the aortic (Ao)flow. B. Pattern B. Delayed onset of the TV flow with delayed onset and cessation (arrows) of the PA flow. C. Pattern C. Delayed onset of the TV flow with synchronous PA and Ao flows. MV, mitral valve.