Patent ID: 8718762

Claim:
A cardiac medical device for delivering anti-tachycardia pacing, comprising: a plurality of electrodes implantable within a patient for sensing cardiac signals and delivering cardiac pacing pulses; a therapy delivery module coupled to the plurality of electrodes for delivering pacing pulses to the patient's heart via the plurality of electrodes; and a controller coupled to the therapy delivery module and adapted to be electrically connected to the plurality of electrodes, the controller configured to: detect a tachycardia episode from the cardiac signals and measure a tachycardia cycle length, control the therapy delivery module to deliver, via the plurality of electrodes, a plurality of dual chamber pacing pulses in response to the detected tachycardia episode; set a tachycardia discrimination blanking interval using the measured tachycardia cycle length to identify all events that occur at a cycle length that is shorter than the measured tachycardia cycle length upon terminating the dual chamber pacing pulses; apply the tachycardia discrimination blanking interval subsequent to delivering the plurality of dual chamber pacing pulses; identify the events sensed during the tachycardia discrimination blanking interval as events that do not correspond to the detected tachycardia episode; identify at least one intrinsic event sensed subsequent to the tachycardia discrimination blanking interval; and classify the detected tachycardia episode as one of ventricular tachycardia and supraventricular tachycardia in response to the at least one sensed intrinsic event subsequent to the tachycardia discrimination blanking interval.