Patent ID: 8639332
Filing Date: 2014-01-28
Classification: A61B,A61N

Abstract:
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; delivering a therapy in response to the detected cardiac event; controlling light emission of an optical sensor in response to delivering the therapy; detecting emitted light scattered by a tissue volume adjacent the optical sensor to generate a corresponding detected light intensity output signal; determining tissue oxygenation measurements in response to the output signal; determining a tissue oxygenation trend in response to the tissue oxygenation measurements; determining whether the delivered therapy restored cardiac hemodynamic function in response to the determined tissue oxygenation trend; simulating an arrhythmia in the patient; terminating the simulated arrhythmia; monitoring tissue oxygenation measurements subsequent to terminating the simulated arrhythmia; and setting a threshold for a trend in the tissue oxygenation measurement in response to the monitoring, wherein determining whether the delivered therapy restored cardiac hemodynamic function comprises comparing the trend to the stored threshold.