Method and apparatus for post-shock evaluation using tissue oxygenation measurements
First Claim
1. A method for delivering therapy in a medical device, comprising:
- sensing cardiac signals;
detecting a cardiac event in response to the sensed cardiac signals using first detection criteria;
delivering a therapy in response to the detected cardiac event;
controlling light emission of a sensor in response to delivering the therapy;
detecting emitted light scattered by a tissue volume adjacent the sensor to generate a corresponding detected light intensity output signal;
determining tissue oxygenation measurements in response to the light intensity output signal;
determining a tissue oxygenation trend in response to the tissue oxygenation measurements;
determining a recovery index in response to the determined tissue oxygenation trend;
selecting redetection criteria in response to the determined recovery index; and
performing redetection of the detected cardiac event using the selected redetection criteria.
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Accused Products
Abstract
A method and device for delivering therapy that includes an electrode to sense cardiac signals and to deliver a therapy, a monitoring module detecting a cardiac event in response to the sensed cardiac signals using first detection criteria, a sensor emitting light and detecting emitted light scattered by a tissue volume adjacent the sensor to generate a corresponding detected light intensity output signal, a control module coupled to the sensor to control light emission of the sensor in response to delivering the therapy, and a controller coupled to the monitoring module, the therapy delivery module and the sensor, the controller configured to determine tissue oxygenation measurements in response to the output signal, determine a tissue oxygenation trend in response to the tissue oxygenation measurements, determine a recovery index in response to the determined tissue oxygenation trend, and control one or both of detecting a cardiac event by the monitoring module and delivery of therapy by the therapy delivery module in response to the determined recovery index.
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Citations
21 Claims
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1. A method for delivering therapy in a medical device, comprising:
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sensing cardiac signals; detecting a cardiac event in response to the sensed cardiac signals using first detection criteria; delivering a therapy in response to the detected cardiac event; controlling light emission of a sensor in response to delivering the therapy; detecting emitted light scattered by a tissue volume adjacent the sensor to generate a corresponding detected light intensity output signal; determining tissue oxygenation measurements in response to the light intensity output signal; determining a tissue oxygenation trend in response to the tissue oxygenation measurements; determining a recovery index in response to the determined tissue oxygenation trend; selecting redetection criteria in response to the determined recovery index; and performing redetection of the detected cardiac event using the selected redetection criteria. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A medical device for delivering a therapy, comprising:
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an electrode to sense cardiac signals and to deliver a therapy; a monitoring module detecting a cardiac event in response to the sensed cardiac signals using first detection criteria; a therapy delivery module coupled to the monitoring module and the electrode to deliver a therapy via the electrode in response to the monitoring module detecting the cardiac event; a sensor emitting light and detecting emitted light scattered by a tissue volume adjacent the sensor to generate a corresponding detected light intensity output signal; a control module coupled to the sensor to control light emission of the sensor in response to delivering the therapy; and a controller coupled to the monitoring module, the therapy delivery module and the sensor, the controller configured to determine tissue oxygenation measurements in response to the light intensity output signal, determine a tissue oxygenation trend in response to the tissue oxygenation measurements, determine a recovery index in response to the determined tissue oxygenation trend, select redetection criteria in response to the determined recovery index, and perform redetection of the detected cardiac event using the selected redetection criteria. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A non-transitory computer readable medium having computer executable instructions for performing a method comprising:
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sensing cardiac signals; detecting a cardiac event in response to the sensed cardiac signals using first detection criteria; delivering a therapy in response to the detected cardiac event; controlling light emission of a sensor in response to delivering the therapy; detecting emitted light scattered by a tissue volume adjacent the sensor to generate a corresponding detected light intensity output signal; determining tissue oxygenation measurements in response to the light intensity output signal; determining a tissue oxygenation trend in response to the tissue oxygenation measurements; determining a recovery index in response to the determined tissue oxygenation trend; selecting redetection criteria in response to the determined recovery index; and performing redetection of the detected cardiac event using the selected redetection criteria.
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Specification