SYSTEM AND METHOD TO LOCALIZE CHANGES IN INTRATHORACIC FLUID CONTENT USING MEASURED IMPEDANCE IN AN IMPLANTABLE DEVICE
First Claim
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1. A method of detecting a thoracic fluid condition in an implantable medical device system, comprising:
- measuring intrathoracic impedance for a plurality of intrathoracic measurement vectors using a plurality of implanted electrodes;
computing a map of thoracic conductivity in response to the measured intrathoracic impedances; and
detecting the thoracic fluid condition in response to the computed map.
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Abstract
An implantable medical device and associated methods monitor thoracic fluid status and discriminate thoracic fluid conditions. Intrathoracic impedance is measured along multiple intrathoracic measurement vectors using implanted electrodes. A map of thoracic conductivity is computed using the measured intrathoracic impedances. A thoracic fluid condition is detected in response to the computed map.
52 Citations
19 Claims
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1. A method of detecting a thoracic fluid condition in an implantable medical device system, comprising:
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measuring intrathoracic impedance for a plurality of intrathoracic measurement vectors using a plurality of implanted electrodes; computing a map of thoracic conductivity in response to the measured intrathoracic impedances; and detecting the thoracic fluid condition in response to the computed map. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An implantable medical device, comprising;
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a plurality of electrodes implanted along the thoracic cavity of a patient; an impedance measuring module for measuring intrathoracic impedance for a plurality of intrathoracic measurement vectors between the plurality of electrodes; a mapping module computing thoracic conductivity mapping data in response to the measured intrathoracic impedances; a memory storing the conductivity map data; and a processor detecting a thoracic fluid condition in response to the conductivity map data. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A system for detecting a thoracic fluid condition in an implantable medical device, comprising:
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means for measuring intrathoracic impedance for a plurality of intrathoracic measurement vectors; means for computing a map of thoracic conductivity in response to the measured intrathoracic impedances; and means for detecting the thoracic fluid condition in response to the computed map.
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Specification