Multi-frequency impedance monitoring system
First Claim
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1. A system for measuring intrathoracic impedance across a plurality of selected tissue segments, comprising:
- at least one lead carrying a plurality of electrodes, the electrodes being positioned so that selected pairs of electrodes span selected ones of the plurality of selected tissue segments;
impedance measurement circuitry for measuring an impedance between the selected pairs of electrodes; and
processing circuitry for evaluating the measured impedance between at least one of the selected pairs of electrodes to determine whether the tissue segment is in a diseased condition, and for providing an indicator of disease based on the determination of whether the tissue segment is in a diseased condition.
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Abstract
A system and method is provided to measure intrathoracic complex impedance and to identify and indicate disease conditions based on the impedance measurements. Multiple impedance vectors may be taken into account, and an optimal vector may be selected to provide the most useful impedance measurement for the identification and indication of disease conditions.
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Citations
17 Claims
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1. A system for measuring intrathoracic impedance across a plurality of selected tissue segments, comprising:
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at least one lead carrying a plurality of electrodes, the electrodes being positioned so that selected pairs of electrodes span selected ones of the plurality of selected tissue segments; impedance measurement circuitry for measuring an impedance between the selected pairs of electrodes; and processing circuitry for evaluating the measured impedance between at least one of the selected pairs of electrodes to determine whether the tissue segment is in a diseased condition, and for providing an indicator of disease based on the determination of whether the tissue segment is in a diseased condition. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for measuring intrathoracic impedance across a plurality of selected tissue segments, comprising:
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at least one lead carrying a plurality of electrodes, the electrodes being positioned so that selected pairs of electrodes span selected ones of the plurality of selected tissue segments; impedance measurement circuitry for measuring an impedance between the selected pairs of electrodes; and processing circuitry for evaluating the measured impedance between at least one of the selected pairs of electrodes to determine whether the tissue segment is in a diseased condition, and for providing an indicator of disease based on the determination of whether the tissue segment is in a diseased condition; wherein the at least one lead includes a first lead positioned in a left lateral thorax, and electrodes carried by the first lead are positioned in the left lateral thorax. - View Dependent Claims (9, 10)
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11. A system for measuring intrathoracic impedance across a plurality of selected tissue segments, comprising:
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at least one lead carrying a plurality of electrodes, the electrodes being positioned so that selected pairs of electrodes span selected ones of the plurality of selected tissue segments; impedance measurement circuitry for measuring an impedance between the selected pairs of electrodes; and processing circuitry for evaluating the measured impedance between at least one of the selected pairs of electrodes to determine whether the tissue segment is in a diseased condition, and for providing an indicator of disease based on the determination of whether the tissue segment is in a diseased condition; wherein a pair of the selected pairs of electrodes is selected for measurement of impedance therebetween based on a determination that a ratio between a cardiac component of impedance and a respiratory component of impedance is greatest among the selected pairs of electrodes. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification