Pacing in the presence of electromagnetic interference
First Claim
1. A method comprising:
- sensing an electrical signal on an implantable medical lead implanted within a chamber of a heart;
determining whether the sensed electrical signal coincides with a sensed noise signal;
determining whether the sensed electrical signal occurs during a period of time of an expected intrinsic cardiac signal; and
triggering delivery of a pacing pulse on the implantable medical lead implanted within the chamber of the heart in which the electrical signal is sensed before expiration of an escape interval associated with the chamber of the heart in which the electrical signal is sensed when the sensed electrical signal coincides with a sensed noise signal and the sensed electrical signal occurs during the period of time of the expected intrinsic cardiac signal.
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Abstract
This disclosure provides a pacing technique that reduces the effect of oversensing caused by noise on pacing therapy. The IMD delivers a pacing pulse subsequent to sensing an electrical signal on the lead when the sensed electrical signal coincides with an independently detected noise signal and the sensed electrical signal occurs during a period of time of an expected intrinsic cardiac signal. The IMD may, in some instances, trigger delivery of the pacing pulse during the escape interval instead of waiting for the escape interval to expire. Pacing in accordance with the techniques of this disclosure may allow for improved therapy during an MRI procedure by decreasing the risk associated with inappropriate pacing inhibition as well as decreasing the risk associated with pacing during the vulnerable period of the cardiac cycle.
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Citations
19 Claims
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1. A method comprising:
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sensing an electrical signal on an implantable medical lead implanted within a chamber of a heart; determining whether the sensed electrical signal coincides with a sensed noise signal; determining whether the sensed electrical signal occurs during a period of time of an expected intrinsic cardiac signal; and triggering delivery of a pacing pulse on the implantable medical lead implanted within the chamber of the heart in which the electrical signal is sensed before expiration of an escape interval associated with the chamber of the heart in which the electrical signal is sensed when the sensed electrical signal coincides with a sensed noise signal and the sensed electrical signal occurs during the period of time of the expected intrinsic cardiac signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An implantable medical system comprising:
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an implantable medical lead implanted within a chamber of a heart and including at least one electrode; an implantable medical device comprising; a noise detection module that detects noise signals; a sensing module that detects an electrical signal of the chamber of the heart on the implantable medical lead; a therapy module that delivers pacing therapy to the chamber of the heart via the implantable medical lead; and a control module that determines whether the sensed electrical signal on the implantable medical lead implanted within the chamber of the heart coincides with a sensed noise signal, determines whether the sensed electrical signal occurs during a period of time of an expected intrinsic cardiac signal, and controls the therapy module to deliver a pacing pulse on the implantable medical lead implanted within the chamber of the heart before expiration of an escape interval associated with the chamber of the heart in which the electrical signal is sensed when the sensed electrical signal coincides with a sensed noise signal and the sensed electrical signal occurs during the period of time of the expected intrinsic cardiac signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A computer-readable storage medium comprising instructions that, when executed, cause an implantable medical device to:
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sense an electrical signal on an implantable medical lead implanted within a chamber of a heart; determine whether the sensed electrical signal coincides with a sensed noise signal; determine whether the sensed electrical signal occurs during a period of time of an expected intrinsic cardiac signal; and trigger delivery of a pacing pulse on the implantable medical lead implanted within the chamber of the heart in which the electrical signal is sensed before expiration of an escape interval associated with the chamber of the heart in which the electrical signal is sensed when the sensed electrical signal coincides with a sensed noise signal and the sensed electrical signal occurs during the period of time of the expected intrinsic cardiac signal.
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Specification