Process and apparatus for monitoring the progress of hemodialysis
First Claim
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1. A process for monitoring the progress of hemodialysis by extra-corporal measurement of hematocrit, comprising the steps of:
- a) continuously measuring values representative of the hematocrit,b) continuously determining variations of these values over a short time period, over a medium time period and over a long time period, and normalizing the values with respect to a unique time base, obtaining thus normalized parameters PCD, PMD, and PLD, representative, respectively, of the variations of the hematocrit value measured over a short time period, over a medium time period, and over a long time period,c) calculating a slope indicator value from the parameters PCD, PMD, and PLD in such a manner that the slope indicator increases inversely proportionally to an increase of the hematocrit,d) determining an alarm indicator value by combining the slope indicator value with a threshold indicator value which depends on the specific hematocrit, and(e) initiating action to prevent cardiovascular collapse in response to reaching the alarm indicator value.
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Abstract
A process and an apparatus for monitoring the progress of haemodialysis by extra-corporeal measurement of the haematocrit are presented. The process comprises the steps of:
calculating at a given time the variation of a function of the haematocrit over a short period, on the one hand, and over a medium period preceding this time, on the other,
comparing the values of these variations,
the result of this comparison is a first indicator of the progress of the haemodialysis.
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Citations
18 Claims
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1. A process for monitoring the progress of hemodialysis by extra-corporal measurement of hematocrit, comprising the steps of:
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a) continuously measuring values representative of the hematocrit, b) continuously determining variations of these values over a short time period, over a medium time period and over a long time period, and normalizing the values with respect to a unique time base, obtaining thus normalized parameters PCD, PMD, and PLD, representative, respectively, of the variations of the hematocrit value measured over a short time period, over a medium time period, and over a long time period, c) calculating a slope indicator value from the parameters PCD, PMD, and PLD in such a manner that the slope indicator increases inversely proportionally to an increase of the hematocrit, d) determining an alarm indicator value by combining the slope indicator value with a threshold indicator value which depends on the specific hematocrit, and (e) initiating action to prevent cardiovascular collapse in response to reaching the alarm indicator value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification