Non-invasive monitoring of hemodynamic parameters using impedanc

Details Non-invasive monitoring of hemodynamic parameters using impedanc Non-invasive monitoring of hemodynamic parameters using impedanc

1996-04-08

1997-11-11

Kamm, William E.

Surgery

Truss

Pad

A01B 50295

Patent

active

056853165

ABSTRACT:
A method and apparatus for determination of heart rate, heart stroke volume, and cardiac output from thoracic bioimpedance signals. A unique bioimpedance electrode arrangement is employed, and the bioimpedance signals are corrected for gain-phase-frequency distortion through the use of sinusoidal test signals through the measuring or detection electrodes to identify distortions and correct for same during actual measurements. Time-derivative bioimpedance signals are employed, the power spectrum calculated, and a novel autoconvolution procedure used to emphasize the heart rate harmonic. Breath waves and other signals not indicative of the patient's cardiocycles are removed. Left ventricular ejection time is derived from the bioimpedance signals, and an improved version of Kubicek's equation is employed to derive heart stroke volume and thus cardiac output.

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