Method and apparatus for post-shock evaluation using tissue oxygenation measurements
First Claim
1. A method of delivering therapy in a medical device, comprising:
- sensing cardiac signals in a patient;
detecting an arrhythmia in response to the signals;
delivering an arrhythmia therapy in response to the arrhythmia detection;
controlling light emission of a sensor in response to delivering the arrhythmia therapy;
detecting emitted light scattered by a tissue volume adjacent the sensor to generate a corresponding detected light intensity output signal;
determining a tissue oxygenation measurement in response to the output signal; and
determining whether the arrhythmia therapy was successful in restoring cardiac hemodynamic function in response to the tissue oxygenation measurement, wherein computing a tissue oxygenation measurement comprises;
computing a second derivative of a light attenuation spectrum measured by the sensor; and
computing a measurement of the total hemoglobin volume fraction in response to the second derivative, wherein determining whether the arrhythmia therapy was successful further comprises detecting an increasing trend in a total hemoglobin volume fraction.
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Abstract
A method and device for delivering therapy that includes an electrode to sense cardiac signals and to deliver a therapy, a therapy delivery module coupled to the electrode to deliver a therapy via the electrode in response to the sensed cardiac signals, 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 therapy delivery module and the sensor, the controller configured to determine a tissue oxygenation measurement in response to the output signal, and determine whether the delivered therapy was successful in restoring cardiac hemodynamic function in response to the tissue oxygenation measurement.
111 Citations
18 Claims
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1. A method of delivering therapy in a medical device, comprising:
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sensing cardiac signals in a patient; detecting an arrhythmia in response to the signals; delivering an arrhythmia therapy in response to the arrhythmia detection; controlling light emission of a sensor in response to delivering the arrhythmia therapy; detecting emitted light scattered by a tissue volume adjacent the sensor to generate a corresponding detected light intensity output signal; determining a tissue oxygenation measurement in response to the output signal; and determining whether the arrhythmia therapy was successful in restoring cardiac hemodynamic function in response to the tissue oxygenation measurement, wherein computing a tissue oxygenation measurement comprises; computing a second derivative of a light attenuation spectrum measured by the sensor; and computing a measurement of the total hemoglobin volume fraction in response to the second derivative, wherein determining whether the arrhythmia therapy was successful further comprises detecting an increasing trend in a total hemoglobin volume fraction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A medical device for delivering a therapy, comprising:
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an electrode to sense cardiac signals and to deliver a therapy; a therapy delivery module coupled to the electrode to deliver a therapy via the electrode in response to the sensed cardiac signals; 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 therapy delivery module and the sensor, the controller configured to determine a tissue oxygenation measurement in response to the output signal, and determine whether the delivered therapy was successful in restoring cardiac hemodynamic function in response to the tissue oxygenation measurement, wherein computing a tissue oxygenation measurement comprises; computing a second derivative of a light attenuation spectrum measured by the sensor; and computing a measurement of the total hemoglobin volume fraction in response to the second derivative, wherein determining whether the arrhythmia therapy was successful further comprises detecting an increasing trend in a total hemoglobin volume fraction. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A non-transitory computer readable medium having computer executable instructions for performing a method comprising:
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sensing cardiac signals in a patient; detecting an arrhythmia in response to the signals; delivering an arrhythmia therapy in response to the arrhythmia detection; controlling light emission of a sensor in response to delivering the arrhythmia therapy; detecting emitted light scattered by a tissue volume adjacent the sensor to generate a corresponding detected light intensity output signal; determining a tissue oxygenation measurement in response to the output signal; and determining whether the arrhythmia therapy was successful in restoring cardiac hemodynamic function in response to the tissue oxygenation measurement, wherein computing a tissue oxygenation measurement comprises; computing a second derivative of a light attenuation spectrum measured by the sensor; and computing a measurement of the total hemoglobin volume fraction in response to the second derivative, wherein determining whether the arrhythmia therapy was successful further comprises detecting an increasing trend in a total hemoglobin volume fraction.
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Specification