Wiggers diagram
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![](/w/images/thumb/f/f4/Wiggers_Diagram.svg/400px-Wiggers_Diagram.svg.png)
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:
- Blood pressure
- Aortic pressure
- Ventricular pressure
- Atrial pressure
- Ventricular volume
- Electrocardiogram
- Arterial flow (optional)
- Heart sounds (optional)
By illustrating the coordinated variation of these values, it becomes easier to illustrate the relationship between these values in the cardiac cycle.
Events
Phase | EKG | Heart sounds | Semilunar valves | Atrioventricular valves | |
A | Atrial systole | P | S4* | closed | open |
B | Ventricular systole - Isovolumetric/isovolumic contraction | QRS | S1 ("lub") | closed | closed |
C1 | Ventricular systole - Ejection 1 | - | open | closed | |
C2 | Ventricular systole - Ejection 2 | T | open | closed | |
D | Ventricular diastole - Isovolumetric/isovolumic relaxation | - | S2 ("dub") | closed | closed |
E1 | Ventricular diastole - Ventricular filling 1 | - | S3* | closed | open |
E2 | Ventricular diastole - Ventricular filling 2 | - | closed | open |
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.
Additional images
See also
External links
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