Patent ID: 8812102

Claim:
An apparatus comprising: a cardiac signal sensing circuit configured to provide a cardiac signal representative of electrical cardiac activity; a physiologic sensor circuit configured to provide a physiologic sensor signal representative of right ventricular pressure; a therapy circuit configured to provide anti-tachyarrhythmia therapy; and a control circuit communicatively coupled to the cardiac signal sensing circuit, the physiologic sensor circuit, and the therapy circuit, wherein the control circuit includes: a cardiac depolarization detection circuit configured to detect a cardiac depolarization using at least one of the cardiac signal and the physiologic sensor signal; a tachyarrhythmia detection circuit; and a timer circuit configured to monitor an electromechanical time interval between a detected mechanical cardiac event and a detected fiducial electrical cardiac event, wherein the detected mechanical event includes peak right ventricular systolic pressure; and wherein the control circuit is configured to: determine a baseline for the electromechanical time interval; normalize the monitored time interval using the determined baseline to form a corrected electromechanical time interval; initiate anti-tachyarrhythmia therapy when the corrected electromechanical time interval satisfies a specified tachyarrhythmia detection time interval threshold value during a detected episode of tachyarrhythmia; and withhold anti-tachyarrhythmia therapy otherwise.