Monitoring of pacing capture using acceleration
AssigneeMedtronic, Inc.
InventorsTodd J. Sheldon, David M. Steinhaus
Life of this patent
Estimating the term…
Abstract
An implantable medical device includes an activity sensor, a pulse generator, and a control module. The control module is configured to determine an activity metric from the activity sensor signal over an activity metric interval and compare the activity metric to a loss of capture detection threshold. The control module may detect loss of capture in response to the activity metric being less than the loss of capture detection threshold and increase a pacing pulse output in response to detecting the loss of capture.
Claims23
A method for detecting loss of pacing capture responsive to therapy delivery by an implantable medical device, comprising:
- delivering pacing pulses to a heart of a patient;
- sensing an activity sensor signal comprising motion signals due to motion of the heart and motion signals due to physical activity of the patient;
- computing an activity metric from the activity sensor signal over an activity metric interval;
- comparing the activity metric to a loss of capture detection threshold;
- detecting loss of capture by the delivered pacing pulses in response to the activity metric being less than the loss of capture detection threshold;
- and
- increasing a pacing pulse output in response to detecting the loss of capture.
An implantable medical device, comprising:
- an activity sensor configured to generate a signal indicative of motion of a heart of a patient and physical activity of the patient;
- a pulse generator configured to generate and deliver pacing pulses to the patient's heart via a pair of electrodes coupled to the implantable medical device;
- and
- a control module coupled to the pulse generator and the activity sensor, the control module being configured to:
- compute an activity metric from the activity sensor signal over an activity metric interval;
- compare the activity metric to a loss of capture detection threshold;
- detect loss of capture by the delivered pacing pulses in response to the activity metric being less than the loss of capture detection threshold;
- and
- increase a pacing pulse output in response to detecting the loss of capture.
A non-transitory, computer readable storage medium storing a set of instructions that, when executed by a control module of an implantable medical device, cause the device to:
- deliver pacing pulses to a heart of a patient;
- sense an activity sensor signal comprising motion signals due to motion of the heart and motion signals due to physical activity of the patient;
- determine an activity metric from the activity sensor signal over an activity metric interval;
- compare the activity metric to a loss of capture detection threshold;
- detect loss of capture of the delivered pacing pulses in response to the activity metric being less than the loss of capture detection threshold;
- and
- increase a pacing pulse output in response to detecting the loss of capture.
Dependencies are inferred from the claim text.