Cardiac pacing response classification based on waveform feature variability
AssigneeCardiac Pacemakers, Inc.
InventorsAlok Sathaye, Derek Bohn
Life of this patent
Estimating the term…
Abstract
Methods and systems involve determining the cardiac response to pacing pulses. The variability cardiac signal features detected during initialization is used to establish a variability threshold. A cardiac signal associated with a pacing pulse is sensed and one or more features of the cardiac signal are detected. The variability of the one or more features is compared to the variability threshold. The cardiac response to the pacing pulse is determined based on the feature variability.
Claims20
A method of operating a cardiac pacing device that delivers pacing pulses to a heart of a patient, the method comprising:
- delivering first pacing pulses to the patient's heart;
- sensing first cardiac signals associated with the first pacing pulses;
- detecting a peak of each of the first cardiac signals;
- measuring a first feature of each of the detected peaks;
- determining a first variability of the measured first features;
- providing a variability threshold based on the first variability;
- delivering, after providing the variability threshold, a second pacing pulse to the patient's heart;
- sensing a second cardiac signal associated with the second pacing pulse;
- detecting a peak of the second cardiac signal;
- measuring a second feature of the detected peak of the second cardiac signal;
- determining a second variability of the measured second feature;
- comparing the second variability to the variability threshold value;
- and
- classifying a cardiac response to the second pacing pulse as fusion if the second variability exceeds the variability threshold value.
A medical system for delivering pacing pulses to a heart of a patient, comprising:
- a pacing circuit configured to deliver pacing pulses to the patient's heart, including first pacing pulses and a second pacing pulse after the first pacing pulses;
- a sensing circuit configured to sense cardiac signals associated with the pacing pulses, including cardiac signals associated with the first pacing pulses and a second cardiac signal associated with the second pacing pulse;
- and
- a processor coupled to the sensing circuit, the processor configured to:
- detect a peak of each of the first cardiac signals;
- measure a first feature of each detected peak of each of the first cardiac signals;
- determine a first variability of the measured first features;
- provide a variability threshold based on the first variability;
- detect a peak of the second cardiac signal;
- measure a second feature of the detected peak of the second cardiac signal;
- determine a second variability of the measured second feature;
- compare the second variability to the variability threshold value;
- and
- classify a cardiac response to the second pacing pulse as fusion if the second variability exceeds the variability threshold value.
Dependencies are inferred from the claim text.