Rate adaptive pacemaker controlled by ejection fraction
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United States of America Patent
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Oct 13, 1992
Grant Date -
N/A
app pub date -
Jun 15, 1991
filing date -
Jun 15, 1991
priority date (Note) -
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status (Latency Note)
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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.
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Family
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