Patent ID: 8332032

Claim:
A cardiac medical device for delivering anti-tachycardia pacing, comprising: a plurality of electrodes implantable within a patient to sense cardiac signals in an atrium and in a ventricle and to deliver therapy in the atrium and in the ventricle; and a controller electrically connected to the plurality of electrodes, the controller detecting a tachycardia from the cardiac signals and controlling delivery of a plurality of pacing pulses via the plurality of electrodes in response to detection of the tachycardia, the plurality of pacing pulses comprising an initial set of single chamber pacing pulses delivered in a single one of the atrium and the ventricle, the other one of the atrium and the ventricle being a non-paced chamber during the initial set of single chamber pacing pulses, the single chamber pacing pulses delivered at a rate faster than a rate of the detected tachycardia, the controller detecting whether a simultaneity between a sensed event in the non-paced chamber and one of the single chamber pacing pulses occurs and delivering a next set of dual chamber pacing pulses delivered in both the atrium and the ventricle in response to detecting the simultaneity.