Method and apparatus for measuring cardiac efficiency

Details Method and apparatus for measuring cardiac efficiency Method and apparatus for measuring cardiac efficiency

1990-05-09

1991-09-10

Jaworski, Francis

Surgery

Truss

Pad

128713, 128668, A61B 502

Patent

active

050465023

ABSTRACT:
A monitoring device for cardiac efficiency receives signals representative of volume and pressure of the ventricle, oxygen consumption and heart rate and processes these signals to determine distinct energy levels during a cardiac cycle to delineate preload and afterload potentials. Cardiac efficiency is then determined as the energy transferred in a transition from the preload level to the afterload level as related to the preload level. Circulatory efficiency is determined as the ratio of transition energy over metabolic rate. Stroke and cardiac deficiency are determined by the ratio of stroke and cardiac preload/afterload potential band overlap divided by maximum stroke and cardiac preload potential, respectively. Circulatory deficiency is determined by the ratio of cardiac preload/afterload potential band overlpa divided by the metabolic rate.

REFERENCES:
patent: 4197836 (1980-04-01), Wagner et al.
patent: 4437469 (1984-03-01), Djordjevich et al.
patent: 4770177 (1988-09-01), Schroeppel
patent: 4858618 (1989-08-01), Konno et al.
patent: 4899751 (1990-02-01), Cohen

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