Detection of drastic blood pressure changes
First Claim
1. An alarm apparatus for predicting a rapid blood pressure decrease in a patient undergoing hemodialysis treatment, comprising:
- an input interface adapted to receive an electrocardiogram signal (HECG) of the patient;
a primary analysis unit adapted to produce a heart-rate-variability signal (pHRV) based on the electrocardiogram signal (HECG);
a secondary analysis unit adapted to determine an intensity of ectopic beats (pEBC)based on the electrocardiogram signal (HECG);
an alarm generating unit adapted to investigate whether the intensity of ectopic beats (pEBC) is relatively low or relatively high, said alarm generating unit being configured to trigger an alarm signal (∀
) indicative of an estimated rapid blood pressure decrease if the heart-rate-variability signal (pHRV) fulfills a first alarm criterion, when said intensity of ectopic beats is relatively low, and said alarm generating unit being further configured to trigger said alarm signal (∀
) indicative of an estimated rapid blood pressure increase if the heartrate variability signal (PHRV) fulfills a second alarm criterion, when said intensity of ectopic beats is relatively high.
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Accused Products
Abstract
The invention relates to cardiac-activity based prediction of a rapid drop in a patient'"'"'s blood pressure during hemodialysis. A proposed alarm apparatus includes an input interface, primary and secondary analysis units and an alarm-generating unit. An electrocardiogram signal (HECG) of the patient is received via the input interface by the primary analysis unit, which in response thereto produces a heart-rate-variability signal (PHRV). The secondary analysis unit determines an intensity of ectopic beats (PEBC) based on the electrocardiogram signal (HECG). The alarm-generating unit investigates whether the intensity of ectopic beats (PEBC) is relatively low or relatively high. In case of a relatively low intensity, the unit triggers an alarm signal (α) indicative of an estimated rapid blood pressure decrease if the heart-rate-variability signal (PHRV) fulfills a first alarm criterion. In case of a relatively high intensity, however, the unit triggers the alarm signal (α) if the intensity of the ectopic beats (PEBC) fulfills a second alarm criterion.
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Citations
30 Claims
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1. An alarm apparatus for predicting a rapid blood pressure decrease in a patient undergoing hemodialysis treatment, comprising:
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an input interface adapted to receive an electrocardiogram signal (HECG) of the patient; a primary analysis unit adapted to produce a heart-rate-variability signal (pHRV) based on the electrocardiogram signal (HECG); a secondary analysis unit adapted to determine an intensity of ectopic beats (pEBC)based on the electrocardiogram signal (HECG); an alarm generating unit adapted to investigate whether the intensity of ectopic beats (pEBC) is relatively low or relatively high, said alarm generating unit being configured to trigger an alarm signal (∀
) indicative of an estimated rapid blood pressure decrease if the heart-rate-variability signal (pHRV) fulfills a first alarm criterion, when said intensity of ectopic beats is relatively low, and said alarm generating unit being further configured to trigger said alarm signal (∀
) indicative of an estimated rapid blood pressure increase if the heartrate variability signal (PHRV) fulfills a second alarm criterion, when said intensity of ectopic beats is relatively high. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for predicting a rapid blood pressure decrease in a patient undergoing hemodialysis treatment, comprising the steps of:
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registering an electrocardiogram signal (HECG) of the patient; and producing a heart rate variability signal (pHRV) based on the electrocardiogram signal (HECG), based on the substeps of; determining an intensity of ectopic beats (pEBC) based on the electrocardiogram signal (HECG); and investigating whether the intensity of ectopic beats (pEBC) for a current period is relatively high or relatively low; during periods of relatively low ectopic beat intensity (PEBC); triggering an alarm signal (∀
) indicative of an estimated rapid blood pressure decrease if the heart-rate-variability signal (pHRV) fulfills a first alarm criterion, and during periods of relatively high ectopic beat intensity (pEBC);triggering said alarm signal (∀
) if the intensity of ectopic beats (pEBC) fulfills a second alarm criterion. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification