Patent ID: 7020524
Filing Date: 2006-03-28
Classification: A61N

Abstract:
1. An implantable cardiac stimulation device comprising: detection circuitry adapted to be coupled to at least one electrode in an atrium and to at least one electrode in a ventricle, the detection circuitry being operative to receive cardiac signals from the respective electrodes to detect atrial events and intrinsic ventricular events; a pulse generator adapted to be coupled to the at least one electrode in the ventricle and configured to generate stimulation pulses to stimulate the ventricle; and a controller connected to the detection circuitry and operative to determine, at various times, heart rates based on at least one of the atrial events and intrinsic ventricular events, and to calculate delay values between atrial events and intrinsic ventricular events for a plurality of different heart rates, wherein the controller is operative to control the pulse generator to perform a ventricular capture threshold search using an atrio-ventricular delay that is based on a current heart rate and the calculated delay value for the current heart rate.