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Detection of Drastic Blood Pressure Changes

  • US 20080319332A1
  • Filed: 08/10/2006
  • Published: 12/25/2008
  • Est. Priority Date: 09/12/2005
  • Status: Active Grant
First Claim
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1. An alarm apparatus for predicting a rapid blood pressure decrease in a patient undergoing extracorporeal blood treatment, the apparatus comprising:

  • an input interface configured to receive a basic electrocardiogram signal (HECG) of the patient, andat least one analysis unit configured to produce at least one processed signal (ECGCL, pHRV, pEBC, pHRT) on the basis of the basic electrocardiogram signal (HECG), said basic electrocardiogram signal (HECG) having a plurality of signal segments, wherein the apparatus comprises;

    a primary beat morphology analysis unit configured to;

    discriminate heartbeats in the basic electrocardiogram signal (HECG),classify each discriminated heartbeat into one out of at least two different beat categories,associate each of the plurality of signal segments of the basic electrocardiogram signal (HECG) with event-type data reflecting a beat category represented by the signal during that segment, the event-type data and the basic electrocardiogram signal (HECG) together forming an enhanced electrocardiogram signal (ECGCL), anddetermine a number of secondary signal analyses to be performed in respect of the basic electrocardiogram signal (HECG);

    a bank of secondary analysis units (B2) configured to receive and use the enhanced electrocardiogram signal (ECGCL) to perform up to at least two different types of secondary analyses in response to control instructions (c1, c2, c3) from the primary beat morphology analysis unit, and for each analysis performed to produce a respective test signal (pHRV, pEBC, pHRT); and

    an alarm generating unit configured to receive the test signals (pHRV, pEBC, pHRT), investigate whether any of the test signals (pHRV, pEBC, pHRT) fulfill at least one alarm criterion, and if so, trigger an alarm signal (α

    ) indicative of an estimated rapid blood pressure decrease.

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