Prediction of rapid symptomatic blood pressure decrease
First Claim
1. An alarm arrangement, comprising:
- a pulse recording device configured to repeatedly register a pulse shape parameter in a peripheral body part of a subject, said pulse recording device having a pulse oximetry instrument configured to register the pulse shape parameter based on light response variations in at least one blood vessel of the subject; and
a control unit configured to receive the pulse shape parameter and investigate whether the pulse shape parameter fulfills an alarm criterion, wherein if said alarm criterion is fulfilled, said control unit causes an alarm to be activated, said control unit having a processing unit configured to;
calculate an initial pulse magnitude measure based on a pulse shape parameter received at a first instance;
store the initial pulse magnitude measure in a memory means associated with the control unit;
calculate, during a measurement period subsequent to the first instance, a respective pulse magnitude measure based on each of a number of received pulse shape parameters; and
investigate, for each pulse magnitude measure in the measurement period, whether the pulse magnitude measure fulfills a decision criterion relative to the initial pulse magnitude measure, and wherein said decision criterion is fulfilled, said processing unit is further configured to generate an alarm triggering signal.
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Accused Products
Abstract
The invention relates to prediction of a rapid symptomatic drop in a subject'"'"'s blood pressure, e.g. during a medical treatment or when operating an aircraft. To this aim, a pulse shape parameter (Pps) with respect to a peripheral body part (105) of the subject (P) is registered by means of a pulse oximetry instrument (110) adapted to detect light response variations in blood vessels. An initial pulse magnitude measure is calculated based on a pulse shape parameter (Pps) received at a first instance. During a measurement period subsequent to the first instance, a respective pulse magnitude measure is calculated based on each of a number of received pulse shape parameters (Pps). It is further investigated, for each pulse magnitude measure in the measurement period, whether or not the measure fulfills a decision criterion relative to the initial pulse magnitude measure. An alarm triggering signal (α) is generated if the decision criterion is found to be fulfilled.
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Citations
24 Claims
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1. An alarm arrangement, comprising:
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a pulse recording device configured to repeatedly register a pulse shape parameter in a peripheral body part of a subject, said pulse recording device having a pulse oximetry instrument configured to register the pulse shape parameter based on light response variations in at least one blood vessel of the subject; and a control unit configured to receive the pulse shape parameter and investigate whether the pulse shape parameter fulfills an alarm criterion, wherein if said alarm criterion is fulfilled, said control unit causes an alarm to be activated, said control unit having a processing unit configured to; calculate an initial pulse magnitude measure based on a pulse shape parameter received at a first instance; store the initial pulse magnitude measure in a memory means associated with the control unit; calculate, during a measurement period subsequent to the first instance, a respective pulse magnitude measure based on each of a number of received pulse shape parameters; and investigate, for each pulse magnitude measure in the measurement period, whether the pulse magnitude measure fulfills a decision criterion relative to the initial pulse magnitude measure, and wherein said decision criterion is fulfilled, said processing unit is further configured to generate an alarm triggering signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method, comprising:
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registering a pulse shape parameter in respect of a peripheral body part of a subject at repeated occasions, investigating, for each pulse shape parameter, whether the pulse shape parameter fulfills an alarm criterion, and if the alarm criterion is fulfilled; causing an alarm to be activated, wherein the registering of the pulse shape parameter involves a pulse oximetry measurement, said pulse shape parameter being determined based on light response variations in at least one blood vessel of the subject, and the method further comprising; calculating an initial pulse magnitude measure based on a pulse shape parameter received at a first instance; storing the initial pulse magnitude measure in a memory means;
calculating, during a measurement period subsequent to the first instance, a respective pulse magnitude measure based on each of a number of received pulse shape parameters;investigating, for each pulse magnitude measure in the measurement period, whether the measure fulfills a decision criterion relative to the initial pulse magnitude measure, and if the decision criterion is fulfilled; generating an alarm triggering signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification