Air Plethysmography
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Plethysmography Def.
Positions
Waveforms
Warm Water
Ice Water
Tests


PLETHYSMOGRAPHY

From the Greek word "plethysmo", to increase, and "graphos" to write

It is the recording of changes in the volume of a limb of digit as blood moves in and out of it with each cardiac cycle.

Pneumatic plethysmogaphy uses a pneumatic cuff wrapped around an extremity or digit. By standardizing the injected volume of air and therefore the pressure inside the cuff, momentary volume changes are detected by a transducer and displayed as waveforms also called "pulse volume recordings."

These waveforms correspond closely with the waveforms obtained by intra-arterial recording at the same level.

BIBLIOGRAPHY:

Darling, R.C., Raines, J.K. et al. Quantative Segmental Pulse Volume Recorder. A

Clinical Tool.

Surgery 72 - 873 - 887; December 1972.

Winsor, T. - Winsor, D. W. Plethysmography; History and Recent Advances

Angiology; 209 - 218; March 1987.

Birch, G. E. A New Sensitive Portable Plethysmography.

Am Heart J; 23 - 664, 1942