Hydration status monitoring
First Claim
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1. A method for use in dialysis of a subject, the method including, in a processing system configured to perform the steps of:
- a) determining a subject orientation;
b) determining a measured impedance value for at least one body segment;
c) for each body segment, and using the measured impedance values, determining at least a first indicator and a second indicator, the indicators being at least partially indicative of a level of extracellular fluid;
d) determining a difference between the first and second indicators, whereinthe first indicator is determined when the subject is in a first orientation, the second indicator is determined when the subject is in a second orientation, and the first and second orientations are different;
e) monitoring changes in the difference over time, the difference being indicative of hydration status of the subject;
comparing the changes in the difference to a threshold; and
,selectively controlling the dialysis of the subject using the results of the comparison, wherein selectively controlling the dialysis includes halting the dialysis when the changes in the difference fall below the threshold.
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Abstract
A method of determining an indication of the hydration status relating to a subject. The method includes determining a measured impedance value for at least one body segment, and then; for each body segment, using the measured impedance values to determine at least one indicator at least partially indicative of a level of extracellular fluid. Indicators can then be used to determine an indication of the hydration status.
456 Citations
33 Claims
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1. A method for use in dialysis of a subject, the method including, in a processing system configured to perform the steps of:
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a) determining a subject orientation; b) determining a measured impedance value for at least one body segment; c) for each body segment, and using the measured impedance values, determining at least a first indicator and a second indicator, the indicators being at least partially indicative of a level of extracellular fluid; d) determining a difference between the first and second indicators, wherein the first indicator is determined when the subject is in a first orientation, the second indicator is determined when the subject is in a second orientation, and the first and second orientations are different; e) monitoring changes in the difference over time, the difference being indicative of hydration status of the subject; comparing the changes in the difference to a threshold; and
,selectively controlling the dialysis of the subject using the results of the comparison, wherein selectively controlling the dialysis includes halting the dialysis when the changes in the difference fall below the threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. An apparatus for use in dialysis of a subject, the apparatus including a processing system for:
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a) determining a subject orientation; b) determining one or more impedance values for at least one body segment; c) for each body segment, and using the measured impedance values, determining at least a first indicator and a second indicator, the indicators being at least partially indicative of a level of extracellular fluid; and
,d) determining the difference between the first and second indicators wherein the first indicator is determined when the subject is in a first orientation, the second indicator is determined when the subject is in a second orientation, and the first and second orientations are different; e) monitoring changes in the difference over time, the difference being indicative of hydration status of the subject; f) comparing the changes in the difference to a threshold; and g) selectively controlling the dialysis of the subject using the results of the comparison, wherein selectively controlling the dialysis includes halting the dialysis when the changes in the difference fall below the threshold. - View Dependent Claims (33)
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31. A method for use in dialysis of a subject, the method including, in a processing system configured to perform the steps of:
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a) determining a first orientation of the subject; b) determining a first measured impedance value for at least one body segment; c) for each body segment, and using the first measured impedance values, determining at least one first indicator, the first indicator being at least partially indicative of a level of extracellular fluid with the subject in the first orientation; d) determining a second orientation of the subject, wherein the first and second orientations are different; e) determining a second measured impedance value for the at least one body segment; f) for each body segment, and using the second measured impedance values, determining at least one second indicator, the second indicator being at least partially indicative of a level of extracellular fluid with the subject in the second orientation; and g) determining a difference between the first and second indicators; h) monitoring changes in the difference over time, the difference being indicative of hydration status of the subject; i) comparing the changes in the difference to a threshold; and j) selectively controlling the dialysis of the subject using the results of the comparison, wherein selectively controlling the dialysis includes halting the dialysis when the changes in the difference fall below the threshold.
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32. An apparatus for use in dialysis of a subject, the apparatus including a processing system configured to perform the steps of:
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a) determining a first orientation of the subject; b) determining a first measured impedance value for at least one body segment; c) for each body segment, and using the first measured impedance values, determining at least one first indicator, the first indicator being at least partially indicative of a level of extracellular fluid with the subject in the first orientation; d) determining a second orientation of the subject, wherein the first and second orientations are different; e) determining a second measured impedance value for the at least one body segment; f) for each body segment, and using the second measured impedance values, determining at least one second indicator, the second indicator being at least partially indicative of a level of extracellular fluid with the subject in the second orientation; and g) determining a difference between the first and second indicators; h) monitoring changes in the difference over time, the difference being indicative of hydration status of the subject; comparing the changes in the difference to a threshold; and
,selectively controlling the dialysis of the subject using the results of the comparison, wherein selectively controlling the dialysis includes halting the dialysis when the changes in the difference fall below the threshold.
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Specification