Wiggers diagram

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Wiggers Diagram, showing various events of a cardiac cycle.

A Wiggers diagram is a standard diagram used in cardiac physiology named after Dr. Carl J. Wiggers.

The X axis is used to plot time, while the Y axis contains all of the following on a single grid:

By illustrating the coordinated variation of these values, it becomes easier to illustrate the relationship between these values in the cardiac cycle.

Events[edit]

PhaseEKGHeart soundsSemilunar valvesAV valves
AAtrial systolePS4*closedopen
BVentricular systole - Isovolumetric/isovolumic contractionQRSS1 ("lub")closedclosed
C1Ventricular systole - Ejection 1-openclosed
C2Ventricular systole - Ejection 2Topenclosed
DVentricular diastole - Isovolumetric/isovolumic relaxation-S2 ("dub")closedclosed
E1Ventricular diastole - Ventricular filling 1-S3*closedopen
E2Ventricular diastole - Ventricular filling 2-closedopen

Note that during isovolumetric/isovolumic contraction and relaxation, all the heart valves are closed. At no time are all the heart valves open.

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