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Updated: Aug 19, 2026

Impedance Pneumography for Minimally Invasive Measurement of Heart Rate in Late Stage Invertebrates
Published on: April 4, 2020
Physiological correlates of impedance plethysmographic waveform
J B Dharani1, G D Jindal, K I Tahilkar
1Dept. of Physiology, Seth G. S. Medical College, Bombay, Maharashtra.
Abstract:
A review of investigations into the origin of impedance plethysmographic waveform is presented in this article. Attempts made by several investigators in the comparison of impedance plethysmographic estimations of peripheral blood flow with that obtained by standard methods are briefly described. Investigations indicating the negligible contribution from contact impedance at body electrode interface are highlighted. Temporal correlation of impedance plethysmographic waveform recorded from thorax with various important events of the cardiac cycle is summarised and various hypotheses on the genesis of this waveform are presented.
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