Third heart sound activity index for heart failure monitoring
AssigneeCardiac Pacemakers, Inc.
InventorsKrzysztof Z. Siejko, Laura Green, Gerrard M. Carlson
Life of this patent
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Abstract
A cardiac rhythm management system provides for the trending of a third heart sound (S3) index. The S3 index is a ratio, or an estimate of the ratio, of the number of S3 beats to the number of all heart beats, where the S3 beats are each a heart beat during which an occurrence of S3 is detected. An implantable sensor such as an accelerometer or a microphone senses an acoustic signal indicative heart sounds including S3. An S3 detector detects occurrences of S3 from the acoustic signal. A heart sound processing system trends the S3 index on a periodic basis to allow continuous monitoring of the S3 activity level, which is indicative of conditions related to heart failure.
Claims22
(canceled)
A medical system, comprising:
- a sensing circuit configured to sense at least one cardiac event;
- an acoustic sensor configured to sense an acoustic signal;
- a heart sound detector configured to detect at least third heart sounds (S3) from the acoustic signal;
- and
- a heart sound analyzer circuit coupled to the sensing circuit and the heart sound detector, the heart sound analyzer configured to:
- generate an S3 index from the acoustic signal, the S3 index indicative of S3 activity;
- and
- generate a trend of the S3 index, the trend of the S3 index indicative of heart failure.
A method for operating a medical system, the method comprising:
- sensing at least one cardiac event;
- sensing an acoustic signal using an acoustic sensor;
- detecting at least third heart sounds (S3) from the acoustic signal;
- generating an S3 index from the acoustic signal, the S3 index indicative of S3 activity;
- and
- generating a trend of the S3 index, the trend of the S3 index indicative of heart failure.
Dependencies are inferred from the claim text.