- Wiggers diagram
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:
* Ventricular volume
* Arterial flow (optional)
By illustrating the coordinated variation of these values, it becomes easier to illustrate the relationship between these values in the
It is named after
Carl J. Wiggers. (The diagram is frequently incorrectly called a "Wigger's diagram". Although "Wiggers's diagram" would be grammatically correct, it is more frequently rendered "Wiggers diagram", with no apostrophe.)
Note that during isovolumetric/isovolumic contraction and relaxation, all the
heart valvesare closed. At no time are all the heart valves open.
*S3 and S4 heart sounds are associated with pathologies and are not routinely heard.
Pressure volume diagram
* [http://library.med.utah.edu/kw/pharm/hyper_heart1.html Flash animation at utah.edu]
* [http://sprojects.mmi.mcgill.ca/cardiophysio/EKGwiggers.htm Diagram at mmi.mcgill.ca]
* [http://www.ouhscphysio.org/humanphys/animations/Wiggers/sld001.htm Slides at ouhscphysio.org]
* [http://omaha.physiology.arizona.edu/Physiology485/Gore/Lecture10/Lect10Figs/L10.Fig4A.html?Submit=Press+to+see+Figure+4A Diagram at arizona.edu]
* [http://www.cals.ncsu.edu/physiology/cardio_res.htm Diagram at cals.ncsu.edu]
* [http://www.the-aps.org/about/pres/introcjw.htm Biography of Carl Wiggers]
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