Patent ID: 8311631
Filing Date: 2012-11-13
Classification: A61N

Abstract:
1. An implantable device, comprising: electrodes for electrically coupling to a patient's heart; an activity sensor configured to detect activity of the patient; a physiologic sensor configured to measure physiologic demand of the patient; memory configured to store patient profile data, the patient profile data comprising heart rate response data relative to varying workloads established for the patient; and a processor coupled to the electrodes, activity sensor, physiologic sensor, and memory, the processor configured to determine onset of sustained patient activity and that a heart rate parameter of the patient has reached a steady-state in response to the sustained patient activity, the processor configured to determine a timing relationship between the onset of sustained patient activity and the heart rate parameter reaching the steady-state, and to one or both of initiate and change a pacing therapy based on a comparison of the timing relationship to a stored patient profile of the patient's heart rate response to varying workloads indicating slow heart rate response to the sustained patient activity.