THIRD HEART SOUND ACTIVITY INDEX FOR HEART FAILURE MONITORING
First Claim
1. A cardiac rhythm management system comprising:
- an implantable system including;
an implantable acoustic sensor to sense an acoustic signal indicative of at least third heart sounds (S3);
an implant heart sound processor, coupled to the implantable acoustic sensor, to process the acoustic signal; and
an implant telemetry module, coupled to the implant heart sound processor, to transmit the processed acoustic signal; and
an external system communicatively coupled to the implantable medical device, the external system including;
an external telemetry module to receive the processed acoustic signal; and
an external heart sound module coupled to the external telemetry module, the external heart sound module including means for generating a trend of an S3 index, wherein the S3 index is a ratio of a number of heart beats with S3 detected during a predetermined time period to a total number of heart beats detected during the predetermine time period.
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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.
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Citations
20 Claims
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1. A cardiac rhythm management system comprising:
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an implantable system including;
an implantable acoustic sensor to sense an acoustic signal indicative of at least third heart sounds (S3);
an implant heart sound processor, coupled to the implantable acoustic sensor, to process the acoustic signal; and
an implant telemetry module, coupled to the implant heart sound processor, to transmit the processed acoustic signal; and
an external system communicatively coupled to the implantable medical device, the external system including;
an external telemetry module to receive the processed acoustic signal; and
an external heart sound module coupled to the external telemetry module, the external heart sound module including means for generating a trend of an S3 index, wherein the S3 index is a ratio of a number of heart beats with S3 detected during a predetermined time period to a total number of heart beats detected during the predetermine time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A cardiac rhythm management system comprising:
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an implantable system including;
a sensing circuit to sense at least one electrogram;
an event detector, coupled to the sensing circuit, to produce a cardiac signal indicative of heart beats; and
an acoustic sensor to sense an acoustic signal indicative of at least third heart sounds (S3);
an external system communicatively coupled to the implantable medical device; and
a heart sound processing system included in one or more of the implantable system and the external system, the heart sound processing system including a heart sound analyzer adapted to generate a trend of an S3 index using the cardiac signal indicative of heart beats and the acoustic signal indicative of at least S3, the S3 index being a ratio of a number of S3 beats detected during a predetermined time period to a total number of heart beats detected during the predetermine time period, the S3 beats each being a heart beat during which one of S3 is detected. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification