Ischemia detection using a heart sound sensor
First Claim
1. A system comprising:
- an implantable medical device (IMD) comprising;
an implantable heart sound sensor operable to produce an electrical signal representative of at least one heart sound, the heart sound associated with mechanical activity of a patient'"'"'s heart;
a heart sound sensor interface circuit coupled to the heart sound sensor to produce a heart sound signal; and
a signal analyzer circuit coupled to the heart sound sensor interface circuit, wherein the signal analyzer circuit is configured to;
measure a baseline value of a characteristic of at least one of an S3 or S4 heart sound in the heart sound signal;
deem that an ischemic event occurred using a measured subsequent change in the heart sound characteristic from the established baseline value of the characteristic; and
discriminate a transient ischemic event from an acute myocardial infarction using the measured subsequent change in the heart sound signal from the established baseline heart sound signal.
1 Assignment
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Accused Products
Abstract
A system comprising an implantable medical device (IMD) includes an implantable heart sound sensor to produce an electrical signal representative of at least one heart sound. The heart sound is associated with mechanical activity of a patient'"'"'s heart. Additionally, the IMD includes a heart sound sensor interface circuit coupled to the heart sound sensor to produce a heart sound signal, and a signal analyzer circuit coupled to the heart sound sensor interface circuit. The signal analyzer circuit measures a baseline heart sound signal, and deems that an ischemic event has occurred using, among other things, a measured subsequent change in the heart sound signal from the established baseline heart sound signal.
291 Citations
19 Claims
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1. A system comprising:
an implantable medical device (IMD) comprising; an implantable heart sound sensor operable to produce an electrical signal representative of at least one heart sound, the heart sound associated with mechanical activity of a patient'"'"'s heart; a heart sound sensor interface circuit coupled to the heart sound sensor to produce a heart sound signal; and a signal analyzer circuit coupled to the heart sound sensor interface circuit, wherein the signal analyzer circuit is configured to; measure a baseline value of a characteristic of at least one of an S3 or S4 heart sound in the heart sound signal; deem that an ischemic event occurred using a measured subsequent change in the heart sound characteristic from the established baseline value of the characteristic; and discriminate a transient ischemic event from an acute myocardial infarction using the measured subsequent change in the heart sound signal from the established baseline heart sound signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A system comprising:
an implantable medical device (IMD) comprising; an implantable heart sound sensor operable to produce an electrical signal representative of at least one heart sound, the heart sound associated with mechanical activity of a patient'"'"'s heart; a heart sound sensor interface circuit coupled to the heart sound sensor to produce a heart sound signal; at least one implantable cardiac signal sensing circuit operable to produce an electrical cardiac signal representative of cardiac activity of the patient; and a signal analyzer circuit coupled to the heart sound sensor interface circuit and the cardiac signal sensing circuit, wherein the signal analyzer circuit is configured to; measure a heart sound signal in association with the electrical cardiac activity signal; measure a baseline value of a characteristic of at least one of an S3 or S4 heart sound in the heart sound signal; assign a first weight to the measured subsequent change in the heart sound signal from the established baseline heart sound signal and a second weight to the measured change in the electrical cardiac signal from an established baseline electrical cardiac signal; and deem that an ischemic event occurred using a measured change in the electrical cardiac signal from an established baseline electrical cardiac signal, a measured subsequent change in the heart sound characteristic from the established baseline value of the characteristic, and the assigned weights.
Specification