Patent ID: 7873414

Claim:
A system comprising: a first device including: at least one implantable sensor circuit configured to produce an electrical sensor signal related to one or more physiologic cardiovascular events of a subject; a therapy circuit configured to provide anti-tachycardia pacing (ATP) therapy and a controller, communicatively coupled to the sensor circuit and the therapy circuit, the controller including: a tachyarrhythmia detection circuit configured to detect a tachyarrhythmia episode in the subject using the electrical sensor signal, and to determine whether the tachyarrhythmia episode is of a type that is treatable with ATP; and an efficacy circuit configured to, before beginning delivery of a currently configured ATP therapy in response to the detected tachyarrhythmia episode, estimate a cumulative subject-specific currently-configured ATP therapy efficacy, and wherein the controller is configured to: compare the cumulative subject-specific efficacy to a physiological condition specific efficacy threshold determined using a patient population; and alter the delivery regimen of the ATP therapy when the cumulative subject-specific efficacy is less than the physiological condition-specific efficacy threshold.