METHOD AND APPARATUS FOR DETECTING FIBRILLATION USING CARDIAC LOCAL IMPEDANCE
First Claim
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1. A cardiac rhythm management system coupled to a heart, the system comprising:
- a first implantable lead including a proximal end, a distal end, and an elongate lead body coupled between the proximal end and the distal end, the distal end configured to be placed in the heart and including a first pair of impedance sensing electrodes configured to sense a cardiac local impedance signal indicative of a cardiac local wall motion; and
an implantable medical device configured to be coupled to the proximal end of the first implantable lead, the implantable medical device including;
an impedance sensing circuit adapted to sense the cardiac local impedance signal using the first pair of impedance sensing electrodes; and
an impedance-based tachyarrhythmia detector adapted to detect a predetermined-type tachyarrhythmia using the cardiac local impedance signal.
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Abstract
A cardiac rhythm management (CRM) system detects tachyarrhythmia using cardiac local impedance indicative of cardiac local wall motion. A cardiac local impedance signal indicative of an impedance of a cardiac region is sensed by using a pair of bipolar electrodes placed in that cardiac region. Tachyarrhythmia such as VF is detected by analyzing one or more cardiac local impedance signals sensed in one or more cardiac regions.
116 Citations
34 Claims
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1. A cardiac rhythm management system coupled to a heart, the system comprising:
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a first implantable lead including a proximal end, a distal end, and an elongate lead body coupled between the proximal end and the distal end, the distal end configured to be placed in the heart and including a first pair of impedance sensing electrodes configured to sense a cardiac local impedance signal indicative of a cardiac local wall motion; and an implantable medical device configured to be coupled to the proximal end of the first implantable lead, the implantable medical device including; an impedance sensing circuit adapted to sense the cardiac local impedance signal using the first pair of impedance sensing electrodes; and an impedance-based tachyarrhythmia detector adapted to detect a predetermined-type tachyarrhythmia using the cardiac local impedance signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for detecting tachyarrhythmia, the method comprising:
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sensing a cardiac local impedance signal indicative of a cardiac local wall motion using a first pair of impedance sensing electrodes at a distal end of a first implantable lead; and detecting a predetermined-type tachyarrhythmia using the cardiac local impedance signal. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification