Rate adaptive pacemaker controlled by ejection fraction

Details Rate adaptive pacemaker controlled by ejection fraction Rate adaptive pacemaker controlled by ejection fraction

1991-06-15

1992-10-13

Kamm, William E.

Surgery

Truss

Pad

A61N 1362

Patent

active

051541718

ABSTRACT:
A rate adaptive pacer designed to accommodate changes in a patient's metabolic demand utilizes ventricular ejection fraction (EF) as the rate controlling parameter. Ejection fraction is measured by sensing intracardiac impedance at end-diastole and end-systole and then using these measurements to compute stroke volume (SV). Ejection fraction is the stroke volume divided by the end-diastolic volume. This calculated value of EF is processed by the pacemaker to determine the escape interval (pacing rate) through a simple conversion algorithm.

REFERENCES:
patent: 4535774 (1985-08-01), Olson
patent: 4730619 (1988-03-01), Koning et al.
patent: 4773401 (1988-09-01), Citak et al.
patent: 4802481 (1989-02-01), Schroeppel

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