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Waveform Component Phase of Cardiac Cycle Mechanical Event
a wave end-diastole atrial contraction
c wave
(after ECG R spike)
early systole isovolumic ventricular contraction -
tricuspid motion into (R) atrium
x descent mid-systole atrial relaxation -
descent of base, systolic collapse
v wave late systole systolic filling of atrium
y descent early diastole early ventricular filling,
diastolic collapse
h wave mid- to late diastole diastolic plateau

N.B. Timing of arterial waveform is delayed (radial artery)

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