Histogram-based thoracic impedance monitoring
First Claim
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1. A system comprising:
- an implantable medical device including,an electrical impedance measurement circuit configured to measure one or more thoracic impedance-indicating signal characteristics, including at least a liquid status component, using information about electrical energy injected between two or more electrodes and a potential difference created thereby between the same or different two or more electrodes; and
a memory circuit including a number of histogram bins, each bin representing a subrange of thoracic impedance-indicating signal characteristic values, including values indicative of a liquid status, the memory circuit configured for storing a count representative of the one or more thoracic impedance-indicating signal characteristics, including at least the liquid status component, into a histogram bin having a numerically inclusive subrange; and
a processor circuit including an input to receive and use information about the count representative of the one or more thoracic impedance-indicating signal characteristics, including at least the liquid status component, stored in the histogram to provide a lung edema status indication.
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Abstract
Systems and methods for monitoring pulmonary edema or other thoracic fluid status in a subject use thoracic impedance histogram information. An internal or external processor circuit receives the thoracic impedance histogram information and uses it to compute and provide a lung fluid status indication. The thoracic impedance histogram information can include a count, mean or median of a histogram bin or subrange of bins within the histogram range.
33 Citations
26 Claims
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1. A system comprising:
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an implantable medical device including, an electrical impedance measurement circuit configured to measure one or more thoracic impedance-indicating signal characteristics, including at least a liquid status component, using information about electrical energy injected between two or more electrodes and a potential difference created thereby between the same or different two or more electrodes; and a memory circuit including a number of histogram bins, each bin representing a subrange of thoracic impedance-indicating signal characteristic values, including values indicative of a liquid status, the memory circuit configured for storing a count representative of the one or more thoracic impedance-indicating signal characteristics, including at least the liquid status component, into a histogram bin having a numerically inclusive subrange; and a processor circuit including an input to receive and use information about the count representative of the one or more thoracic impedance-indicating signal characteristics, including at least the liquid status component, stored in the histogram to provide a lung edema status indication. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method comprising:
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measuring a thoracic impedance-indicating signal characteristic including a liquid status component; storing a count representative of the thoracic impedance-indicating signal characteristic, including the liquid status component, in a histogram that includes a plurality of histogram bins representing corresponding subranges of thoracic impedance-indicating signal characteristic values, including values indicative of a liquid status; and computing and providing a lung edema status indication using histogram information about the count representative of the thoracic impedance-indicating signal characteristic, including the liquid status component. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification