Dynamic morphology based atrial automatic threshold
First Claim
1. A method of operating an implantable cardiac rhythm device to deliver pacing to an atrium, the method, comprising:
- delivering atrial pacing;
using a post ventricular refractory period (PVARP) having a first PVARP duration during cardiac cycles of the atrial pacing in which an atrial pace captures the atrium;
using an A-A interval having a first A-A interval duration between cardiac cycles of the atrial pacing in which the atrial pace captures the atrium; and
using a PVARP having a second PVARP duration and using an A-A interval having a second A-A interval duration during cardiac cycles of the atrial pacing in which the atrial pace does not capture the atrium, wherein the second PVARP duration is greater than the first duration PVARP and the second A-A interval duration is greater than the first A-A interval duration.
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Abstract
Methods and systems for performing capture threshold tests are described. During an initialization procedure a capture detection interval and capture detection threshold are determined based on peak values of cardiac signals sensed following the supracapture threshold initialization pulses. Following initialization, a plurality of pacing pulses to the atrium are delivered and the peak values of the cardiac signals sensed following each of the plurality of pacing pulses are determined. The peak values are compared to the pacing artifact threshold and the capture detection threshold. A timing of each of the peak values is compared to the capture detection interval. For each pacing pulse, discrimination between a captured response, a noncaptured response, and a fusion response is based on the peak value and timing comparisons.
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Citations
14 Claims
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1. A method of operating an implantable cardiac rhythm device to deliver pacing to an atrium, the method, comprising:
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delivering atrial pacing; using a post ventricular refractory period (PVARP) having a first PVARP duration during cardiac cycles of the atrial pacing in which an atrial pace captures the atrium; using an A-A interval having a first A-A interval duration between cardiac cycles of the atrial pacing in which the atrial pace captures the atrium; and using a PVARP having a second PVARP duration and using an A-A interval having a second A-A interval duration during cardiac cycles of the atrial pacing in which the atrial pace does not capture the atrium, wherein the second PVARP duration is greater than the first duration PVARP and the second A-A interval duration is greater than the first A-A interval duration. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of operating an implantable cardiac rhythm device to deliver pacing to an atrium, the method, comprising:
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delivering a first atrial pace; delivering a first ventricle pace a time after the first atrial pace; timing a first ventricular refractory period (PVARP); delivering a second atrial pace after the first ventricular refractory period (PVARP); delivering a second ventricle pace a time after the second atrial pace; sensing for an atrial depolarization after the second ventricle pace, indicating the second atrial pace was not captured; if the atrial depolarization was sensed after the second ventricle pace indicating the second atrial pace was not captured, timing a second ventricular refractory period (PVARP) that is longer than the first ventricular refractory period (PVARP); and delivering a third atrial pace after the second ventricular refractory period (PVARP). - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification