Implantable cardiac stimulation device for monitoring heart sounds to detect progression and regression of heart disease and method thereof
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United States of America Patent
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Nov 4, 2003
Grant Date -
N/A
app pub date -
Apr 6, 2000
filing date -
Apr 6, 2000
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Abstract
A system and method for use in an implantable cardiac device permits the monitoring of progression and regression in heart disease, such as congestive heart failure. During a monitoring period, a sensing circuit produces an electrogram signal of the patient's heart and a sound sensor produces a phonocardiogram of the patient's heart. A processor determines a predetermined characteristic of the heart sounds, such as amplitude, time intervals between selected heart sounds, and time intervals between selected heart sound and selected electrogram features for each cardiac cycle occurring during a monitoring period. The predetermined characteristics are thereafter averaged and stored in a memory for later retrieval. Relative changes in the average time intervals over time provides an indication of the progression or regression of the heart disease.
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