Patent ID: 7996084
Filing Date: 2011-08-09
Classification: A61N

Abstract:
1. An implantable medical device (IMD) comprising: at least a pair of pacing electrodes; a pacing therapy delivery circuit operatively coupled to the pacing electrodes and configured to provide pacing signals to the pacing electrodes at a pacing rate; a patient activity sensor coupled to the pacing therapy delivery circuit; a patient input detector adapted to receive a patient-triggered telemetry signal; an ischemia sensor; and controller means for controlling operation of the pacing therapy delivery circuit, wherein the controller means periodically causes an ischemia threshold test to be performed when the patient activity sensor indicates a patient is at rest, wherein the controller means causes the pacing therapy delivery circuitry to increase the pacing rate over time until a feedback signal from either the patient input detector or the ischemia sensor is received, then causes the pacing therapy delivery circuitry to decrease the pacing rate, and causes an ischemia threshold value to be stored based upon the pacing rate at the time the feedback signal was received, wherein the controller adjusts an upper pacing rate limit for the pacing therapy delivery circuit based upon the ischemia threshold value.