THIRD HEART SOUND ACTIVITY INDEX FOR HEART FAILURE MONITORING
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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.
3 Citations
21 Claims
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1. (canceled)
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2. A medical system, comprising:
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a heart sound detector configured to; determine a second heart sound (S2) timing estimate using a received heart sound signal and heart rate information; determine a third heart sound (S3) window with respect to the determined S2 timing estimate; and measure an S3 amplitude using at least a portion of the heart sound signal within the determined S3 window; and a heart failure detector configured to detect a condition indicative of worsening heart failure (WHF) using the measured S3 amplitude. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for operating a medical system, the method comprising:
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determining, via a heart sound detector, a second heart sound (S2) timing estimate using a received heart sound signal and heart rate information; determining, via the heart sound detector, a third heart sound (S3) window with respect to the determined S2 timing estimate; measuring, via the heart sound detector, an S3 amplitude using at least a portion of the received heart sound signal within the determined S3 window; and detecting, via a heart failure detector, a condition indicative of worsening heart failure (WHF) using the measured S3 amplitude. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification