Method and apparatus for noninvasive determination of cardiac ou

Details Method and apparatus for noninvasive determination of cardiac ou Method and apparatus for noninvasive determination of cardiac ou

1985-07-18

1987-06-30

Kamm, William E.

Surgery

Truss

Pad

128663, A61B 502

Patent

active

046762531

ABSTRACT:
A determination of cardiac output of a living being is obtained noninvasively from measurements of heart rate and pulse timing points from a blood flow waveform in relation to the "R" line from a corresponding ECG signal. The blood flow waveform may be obtained indirectly, by differentiating the output of a plethysmograph or an instantaneous blood pressure sensor or by integrating the output of a doppler sensor, or indirectly from a magnetic flowmeter, for example. Heart rate and an "R" line trigger signal may be obtained from an electrocardiogram signal. Experimentally obtained heart rate and pulse timing data were compared with invasively measured cardiac output and were processed by regression analysis to yield an equation correlation of 0.73.

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