DETECTION OF DRASTIC BLOOD PRESSURE CHANGES
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Abstract
A cardiac-activity based prediction of a rapid drop in a patient'"'"'s blood pressure during extracorporeal blood treatment is disclosed. A proposed alarm apparatus includes a primary beat morphology analysis unit bank of secondary analysis units and an alarm generating unit. The primary beat morphology analysis unit discriminates heart beats in a received basic electrocardiogram signal, classifies each beat into one out of at least two different beat categories, and associates each segment of the signal with relevant event-type data. The event-type data and the basic electrocardiogram signal together form an enhanced electrocardiogram signal, based upon which the primary beat morphology analysis unit determines whether one or more secondary signal analyses should be performed. Depending on the enhanced electrocardiogram signal'"'"'s properties, the bank of secondary analysis units performs none, one or more of up to at least two different types of secondary analyses, and for each analysis performed produces a respective test signal. The alarm generating unit receives the test signals, and triggers an alarm signal indicative of an estimated rapid blood pressure decrease, if at least one alarm criterion is fulfilled.
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Citations
65 Claims
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1-33. -33. (canceled)
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34. An alarm apparatus for predicting a rapid blood pressure decrease in a patient undergoing extracorporeal blood treatment, the apparatus comprising:
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an input interface configured to receive a basic electrocardiogram signal of the patient; a primary beat morphology analysis unit configured to; discriminate a first heartbeat and a second heartbeat in the basic electrocardiogram signal, said basic electrocardiogram signal having a plurality of signal segments, classify each of the discriminated first heartbeat and the second heartbeat into one out of at least two different beat categories of which one beat category represents a beat whose morphology is typical for the patient, associate each of the plurality of signal segments of the basic electrocardiogram signal with event-type data reflecting one of said at least two different beat categories represented by the signal during that segment, the event-type data and the basic electrocardiogram signal together forming an enhanced electrocardiogram signal, and determine a number of secondary signal analyses to be performed in respect of the basic electrocardiogram signal; a bank of secondary analysis units configured to; receive and use the enhanced electrocardiogram signal to perform at least two different types of the determined secondary signal analyses in response to control instructions from the primary beat morphology analysis unit, and for each analysis performed, produce a respective test signal; and an alarm generating unit configured to; receive the test signals, investigate whether any of the test signals fulfill at least one alarm criterion, and if so, trigger an alarm signal indicative of an estimated rapid blood pressure decrease. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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51. A method for predicting a rapid blood pressure decrease in a patient undergoing extracorporeal blood treatment, involving:
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receiving a basic electrocardiogram signal of the patient, and producing at least one processed signal on the basis of the basic electrocardiogram signal, said basic electrocardiogram signal having a plurality of signal segments, characterized by; discriminating a first heartbeat and a second heartbeat in the basic electrocardiogram signal, classifying each of the discriminated first heartbeat and the second heartbeat into one out of at least two different beat categories of which one beat category represents a beat whose morphology is typical for the patient, associating each of the plurality of signal segments of the basic electrocardiogram signal with event-type data reflecting one of said at least two different beat categories represented by the signal during a particular signal segment, the event-type data and the basic electrocardiogram signal together forming an enhanced electrocardiogram signal, determining a number of secondary signal analyses to be performed in respect of the basic electrocardiogram signal, performing, based on the enhanced electrocardiogram signal, at least two different types of the determined secondary signal analyses to produce a respective resulting test signal, and investigating whether any of the test signals fulfill at least one alarm criterion, and if so, triggering an alarm signal indicative of an estimated rapid blood pressure decrease. - View Dependent Claims (52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65)
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Specification