Determining paced cardiac depolarization waveform morphological templates
First Claim
1. A method comprising:
- sensing, by an implantable medical device, a cardiac electrogram of a heart of a patient;
identifying, by the implantable medical device, a plurality of cardiac depolarizations within the cardiac electrogram;
determining, by the implantable medical device, that one or more of the cardiac depolarizations are paced cardiac depolarizations resulting from delivery of a pacing pulse to the heart by another implantable medical device without detecting the pacing pulse and without communicating with the other implantable medical device;
identifying, by the implantable medical device, one or more paced cardiac depolarization waveforms of the one or more paced cardiac depolarizations;
determining, by the implantable medical device, a paced cardiac depolarization waveform morphological template based on the one or more identified paced cardiac depolarization waveforms;
determining, by the implantable medical device, that the paced cardiac depolarization waveform morphological template is a paced normal cardiac depolarization waveform morphological template;
comparing, by the implantable medical device, the paced normal cardiac depolarization waveform morphological template to subsequent cardiac depolarization waveforms; and
detecting a cardiac tachyarrhythmia based on the comparison of the paced normal cardiac depolarization waveform morphological template to subsequent cardiac depolarization waveforms.
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Abstract
Techniques for determining paced cardiac depolarization waveform morphological templates are described. For example, an implantable medical device (IMD) may sense a cardiac electrogram of a heart, identify cardiac depolarizations within the cardiac electrogram, and determine that the cardiac depolarizations are paced cardiac depolarizations resulting from delivery of a pacing pulse to the heart by another IMD without detecting the pacing pulse and without communicating with the other IMD. The IMD may identify paced cardiac depolarization waveforms of the paced cardiac depolarizations, determine a paced cardiac depolarization waveform morphological template based on the identified paced cardiac depolarization waveforms, determine a normal cardiac depolarization waveform morphological template based on the paced cardiac depolarization waveform morphological template, and compare the normal cardiac depolarization waveform morphological template to subsequent cardiac depolarization waveforms. The IMD may detect a cardiac tachyarrhythmia based on the above comparison.
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Citations
27 Claims
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1. A method comprising:
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sensing, by an implantable medical device, a cardiac electrogram of a heart of a patient; identifying, by the implantable medical device, a plurality of cardiac depolarizations within the cardiac electrogram; determining, by the implantable medical device, that one or more of the cardiac depolarizations are paced cardiac depolarizations resulting from delivery of a pacing pulse to the heart by another implantable medical device without detecting the pacing pulse and without communicating with the other implantable medical device; identifying, by the implantable medical device, one or more paced cardiac depolarization waveforms of the one or more paced cardiac depolarizations; determining, by the implantable medical device, a paced cardiac depolarization waveform morphological template based on the one or more identified paced cardiac depolarization waveforms; determining, by the implantable medical device, that the paced cardiac depolarization waveform morphological template is a paced normal cardiac depolarization waveform morphological template; comparing, by the implantable medical device, the paced normal cardiac depolarization waveform morphological template to subsequent cardiac depolarization waveforms; and detecting a cardiac tachyarrhythmia based on the comparison of the paced normal cardiac depolarization waveform morphological template to subsequent cardiac depolarization waveforms. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An implantable medical device (IMD), the IMD comprising:
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a housing configured to be implanted in a patent external to a rib cage of the patient; one or more electrodes configured to be disposed external to the rib cage; a sensing module configured to sense a cardiac electrogram of a heart of the patient using the one or more electrodes; and a tachyarrhythmia detection module configured to; identify a plurality of cardiac depolarizations within the cardiac electrogram; determine that one or more of the cardiac depolarizations are paced cardiac depolarizations resulting from delivery of a pacing pulse to the heart by another implantable medical device without detecting the pacing pulse and without communicating with the other implantable medical device; identify one or more paced cardiac depolarization waveforms of the one or more paced cardiac depolarizations; determine a paced cardiac depolarization waveform morphological template based on the one or more identified paced cardiac depolarization waveforms; determine that the paced cardiac depolarization waveform morphological template is a paced normal cardiac depolarization waveform morphological template; compare the paced normal cardiac depolarization waveform morphological template to subsequent cardiac depolarization waveforms; and detect a cardiac tachyarrhythmia based on the comparison of the paced normal cardiac depolarization waveform morphological template to subsequent cardiac depolarization waveforms. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A device comprising:
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means for sensing a cardiac electrogram of a heart of a patient; means for identifying a plurality of cardiac depolarizations within the cardiac electrogram; means for determining that one or more of the cardiac depolarizations are paced cardiac depolarizations resulting from delivery of a pacing pulse to the heart by another implantable medical device without detecting the pacing pulse and without communicating with the other implantable medical device; means for identifying one or more paced cardiac depolarization waveforms of the one or more paced cardiac depolarizations; means for determining a paced cardiac depolarization waveform morphological template based on the one or more identified paced cardiac depolarization waveforms; means for determining that the paced cardiac depolarization waveform morphological template is a paced normal cardiac depolarization waveform morphological template; means for comparing the paced normal cardiac depolarization waveform morphological template to subsequent cardiac depolarization waveforms; and means for detecting a cardiac tachyarrhythmia based on the comparison of the paced normal cardiac depolarization waveform morphological template to subsequent cardiac depolarization waveforms.
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Specification