Cardiac rhythm management system for hypotension
First Claim
Patent Images
1. A method including:
- detecting a thoracic impedance signal associated with a portion of a subject'"'"'s thorax; and
providing a therapy to the subject'"'"'s heart based at least in part on the detected thoracic impedance.
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Abstract
A cardiac rhythm management system detects hypotension based on a measurement of thoracic impedance. It also provides therapy to treat the hypotension.
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Citations
30 Claims
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1. A method including:
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detecting a thoracic impedance signal associated with a portion of a subject'"'"'s thorax; and
providing a therapy to the subject'"'"'s heart based at least in part on the detected thoracic impedance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method including:
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detecting a change in a thoracic impedance signal associated with a subject'"'"'s thorax and including a thoracic fluid shift signal having a frequency component that is less than or equal to a cutoff frequency value that is between 0.01 Hz and 0.5 Hz inclusive; and
increasing a rate of delivery of pacing stimuli based at least in part on a detected increase in a baseline portion of the thoracic impedance signal. - View Dependent Claims (10, 11, 12, 14, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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13. A method including:
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detecting both a hypotension associated with a change in a subject'"'"'s posture and a hypotension that is not associated with a change in the subject'"'"'s posture; and
providing a therapy to the subject'"'"'s heart based at least in part on the detected hypotension.
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15. A cardiac rhythm management system, including:
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first and second electrodes configured for association with a portion of a subject'"'"'s thorax;
a thoracic signal detection module, coupled to the first and second electrodes for receiving a thoracic impedance signal and including an averager/lowpass filter that obtains a baseline portion of the thoracic impedance signal that is associated with a fluid shift away from the thorax; and
means for performing a function of providing therapy to the subject'"'"'s heart based on the baseline portion of the thoracic impedance signal.
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16. A cardiac rhythm management system, including:
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first and second electrodes configured for association with a portion of a subject'"'"'s thorax;
a thoracic signal detection module, coupled to the first and second electrodes for receiving a thoracic impedance signal and including an averager/lowpass filter that obtains a baseline portion of the thoracic impedance signal that is associated with a fluid shift away from the thorax; and
a pacing therapy output circuit providing therapy to the subject'"'"'s heart based on the baseline portion of the thoracic impedance signal.
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17. A cardiac rhythm management system, including:
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first and second electrodes configured for association with a portion of a subject'"'"'s thorax;
means, coupled to the first and second electrodes for receiving a thoracic impedance signal, for performing the function of obtaining a baseline portion of the thoracic impedance signal that is associated with a fluid shift away from the thorax; and
a pacing therapy output circuit providing therapy to the subject'"'"'s heart based on the baseline portion of the thoracic impedance signal.
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18. A cardiac rhythm management system, including:
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first and second electrodes configured for association with a portion of a subject'"'"'s thorax;
a thoracic signal detection module, coupled to the first and second electrodes;
third and fourth electrodes configured for association with a portion of a subject'"'"'s heart;
a pacing therapy output module, coupled to the third and fourth electrodes; and
a pacing stimuli rate controller, coupled to the thoracic signal detection module for receiving a thoracic impedance signal including a signal component associated with a fluid shift away from the thorax, the controller also coupled to the pacing therapy output module for adjusting the rate of delivery of pacing stimuli based at least in part on the portion of the thoracic impedance signal associated with the thoracic fluid shift.
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29. A cardiac rhythm management system, including:
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first and second electrodes configured for association with a portion of a subject'"'"'s thorax;
a thoracic signal detection module, coupled to the first and second electrodes;
thoracic test signal generator configured for association with the thorax for providing energy to the thorax for detecting thoracic impedance;
third and fourth electrodes configured for association with a portion of a subject'"'"'s heart;
a pacing therapy output module, coupled to the third and fourth electrodes; and
a pacing stimuli rate control module, coupled to the thoracic signal detection module for receiving a thoracic impedance signal, the rate control module including a lowpass filter for distinguishing a thoracic fluid shift signal from another variation in thoracic impedance, the rate control module also coupled to the pacing therapy output module for adjusting the rate of delivery of pacing stimuli based at least in part on the thoracic fluid shift.
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30. A cardiac rhythm management system, including:
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means for detecting a thoracic impedance;
first and second electrodes, configured for association with a portion of a subject'"'"'s heart;
a pacing therapy output module, coupled to the first and second electrodes; and
a pacing stimuli rate control module, coupled to the means for detecting thoracic impedance and the pacing therapy output module, the rate control module adjusting a rate of delivery of pacing stimuli based at least in part on a portion of the thoracic impedance associated with thoracic fluid shift.
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Specification