10.5. Impedance Plethysmography
Plethysmography is the measurement of volume. Dynamic plethysmography is usually associated with volume changes caused by the heartbeats, but may also be related to, for example, respiration or peristaltic movements of the alimentary canal. During heart systole with increased blood flow, the volume, for example, of a limb increases due to the inflow of blood (swelling). Impedance may in many cases be regarded as measuring both volume and flow, a volume change must be due to a flow. Measurements may be based upon, for example, mechanical dimensional change (strain-gauge plethysmography, light absorption (photo-plethysmography), X-ray absorption or impedance change). Application areas are rather diversified, for example, ...
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