Patent ID: 6408209
Filing Date: 2002-06-18
Classification: A61N

Abstract:
An active implantable medical device, including:means for analyzing a signal representative of patient activity, discriminating between a rest phase, a normal activity phase and an effort phase, and determining an activity level of a patient; stimulation means for delivering to at least one cardiac cavity pulses at a base frequency; and means for adjusting the base frequency according to the determined activity level, said base frequency having an initial base frequency minimum level during a determined rest phase; wherein the improvement comprises: means for detecting an occurrence of extrasystole events and determining therefrom a corresponding extrasystole rate; and means for comparing the determined extrasystole rate to a predetermined threshold during said rest phase and increasing the base frequency minimum level to an increased level above the initial base frequency minimum level in response to the extrasystole rate exceeding said predetermined threshold.