Ischemia detection using heart sound timing
AssigneeCardiac Pacemakers, Inc.
InventorsAbhilash Patangay, Yi Zhang
Life of this patent
Estimating the term…
Abstract
A system comprising a heart sound sensor to produce a heart sound signal representative of at least one heart sound. A signal analyzer circuit measures a baseline time interval between a first detected physiologic cardiovascular event and at least one second detected physiologic cardiovascular event. At least one of the first and second detected physiologic cardiovascular events includes a heart sound event obtained from the heart sound signal. The sensor analyzer circuit determines that an ischemic event occurred at least in part by detecting a specified measured subsequent change from the established baseline time interval. Other systems and methods are disclosed.
Claims36
A device comprising:
- a heart sound sensor configured to produce a heart sound signal representative of a heart sound, the heart sound associated with mechanical cardiovascular activity of a heart of a subject;
- and
- a signal analyzer circuit in electrical communication with the heart sound sensor, wherein the signal analyzer circuit is configured to:
- establish a baseline time interval between a first detected physiologic cardiovascular event and at least one second detected physiologic cardiovascular event, wherein at least one of the first and second detected physiologic cardiovascular events includes a heart sound event detected using the heart sound signal;
- and
- determine that an ischemic event occurred when a measured subsequent change from the established baseline time interval occurs with a time constant that is within a specified range of time constants.
A method comprising:
- sensing a heart sound event, the sensing including producing at least one heart sound signal representative of the heart sound event, the heart sound event associated with mechanical cardiovascular activity of a heart of a subject;
- establishing a baseline time interval between a first detected physiologic cardiovascular event and at least one second detected physiologic cardiovascular event, wherein at least one of the first and second detected physiologic cardiovascular events includes a heart sound event detected from the heart sound signal;
- and
- determining that an ischemic event occurred when a measured subsequent change from the established baseline time interval occurs with a time constant that is within a specified range of time constants.
Dependencies are inferred from the claim text.