Cardiac pacemaker system and method for determining a measure of pacing threshold without incurring loss of capture
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United States of America Patent
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Oct 7, 1997
Grant Date -
N/A
app pub date -
May 22, 1995
filing date -
May 22, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A implantable cardiac pacemaker system which is battery powered, having an improved capability for monitoring patient threshold and adjusting pace pulse output to an optimized safety factor above patient threshold, thereby avoiding excessive energy expenditure in delivery of pace pulses and maximizing pacemaker lifetime. The improved threshold tracking system analyzes information from detected heart signals and correlates changes in such heart signal information to pulse output energy, enabling a determination of when the pulse output energy is near threshold without dropping below threshold. In a preferred embodiment, changes in the QT interval are monitored and correlated with changes in output pulse energy, enabling the pacemaker to obtain a measure of patient threshold without dropping pulse energy below threshold and suffering loss of capture.
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