SYSTEM AND METHOD OF MONITORING PHYSIOLOGIC PARAMETERS BASED ON COMPLEX IMPEDANCE WAVEFORM MORPHOLOGY
First Claim
1. A method of monitoring physiologic parameters in a patient, the method comprising:
- measuring impedance of a tissue segment located in a selected electrode vector field;
storing baseline impedance information based on the measured impedance;
detecting changes in impedance characteristics from the baseline impedance information; and
providing alerts indicating changes in the physiologic parameters based on the detected changes in impedance characteristics.
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Accused Products
Abstract
Changes in physiologic parameters may be detected in a patient by measuring the impedance of a tissue segment located in a selected electrode vector field, storing baseline impedance information based on the measured impedance, detecting changes in impedance characteristics from the baseline impedance information, and providing alerts for changes in the physiologic parameters based on the detected changes in impedance characteristics. In some situations, detecting the changes in impedance characteristics involves detecting changes in morphology of an impedance waveform, such as a cardiac component of an impedance waveform, a respiratory component of an impedance waveform, and the phase angle of the complex impedance.
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Citations
27 Claims
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1. A method of monitoring physiologic parameters in a patient, the method comprising:
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measuring impedance of a tissue segment located in a selected electrode vector field; storing baseline impedance information based on the measured impedance; detecting changes in impedance characteristics from the baseline impedance information; and providing alerts indicating changes in the physiologic parameters based on the detected changes in impedance characteristics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of monitoring a physiologic parameter in a patient, the method comprising:
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positioning a plurality of electrodes in the patient cutaneously, subcutaneously, intravascularly, intracardially, or any combination of these; selecting an electrode vector from the plurality of electrodes to create an electrode vector field that includes a tissue segment such that a change in impedance in the electrode vector field reflects a change in the physiologic parameter being monitored; measuring impedance of the tissue segment located in the selected electrode vector field; storing baseline impedance information based on the measured impedance; detecting changes in impedance characteristics from the baseline impedance information; and providing alerts indicating changes in the physiologic parameters based on the detected changes in impedance characteristics. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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23. An apparatus for monitoring physiologic parameters in a patient, comprising:
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means for measuring impedance of a tissue segment located in a selected electrode vector field; means for storing baseline impedance information based on the measured impedance; means for detecting changes in impedance characteristics from the baseline impedance information; and providing alerts indicating changes in the physiologic parameters based on the detected changes in impedance characteristics. - View Dependent Claims (24, 25, 26, 27)
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Specification