A Wiggers diagram is a standard diagram used in cardiac physiology.
The X axis is used to plot time, while the Y axis contains all of the following on a single grid:
- Blood pressure
- Ventricular volume
- Arterial flow
- Heart sounds
By illustrating the coordinated variation of these values, it becomes easier to illustrate the relationship between these values in the cardiac cycle.
Note that during isovolumetric/isovolumic contraction and relaxation, all the heart valves are closed. At no time are all the heart valves open.
- S3 and S4 heart sounds are associated with pathologies and are not routinely heard.