Patent ID: 8170671

Claim:
An implantable medical device comprising: a lead including electrodes configured to be positioned within a heart, at least one of the electrodes being capable of sensing cardiac signals; a pulse generator to deliver a stimulus pulse through at least one of the electrodes; an autothreshold module to perform a threshold search when operating in an autothreshold mode, the autothreshold module to cause atrial stimulus pulses to be delivered in an atrium of the heart at an overdrive rate during the threshold search; and a control module to determine an AV conduction time and to apply an overdrive AV adjustment to the AV conduction time to generate an AV delay, the autothreshold module to utilize the AV delay in connection with delivering ventricular stimulus pulses to a ventricle of the heart, wherein the control module measures the AV conduction time between atrial stimulus pulses while the autothreshold module is in the autothreshold mode.