Medical device for detecting hemodynamic conditions of a heart
First Claim
1. A device for detecting hemodynamic conditions of a heart, comprising:
- sensor means for sensing a physiological variable in a living subject and for emitting an electrical signal dependent of said physiological variable, said electrical signal having an average value;
signal editing means for editing said electrical signal to produce an edited signal;
calculating means supplied with said edited signal for calculating a variability measure of the edited sign related to but different from said average value of said electrical signal and correlated to average blood pressure of said living subject; and
comparator means for comparing said variability measure to a threshold selectable dependent on a selected hemodynamic condition, for emitting an indication signal indicating the presence of said selected hemodynamic condition in said living subject when said variability measure falls below said threshold.
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Abstract
A device for detecting hemodynamic conditions in a heart, in particular conditions corresponding to dangerous arrhythmias contains a sensing unit for a physiological variable, such as blood pressure, the unit emitting a signal on the basis of the variable having an average value, a signal conditioning unit connected to the sensing unit, a calculation unit connected to the signal conditioning unit and a comparator after the calculation unit. The calculation unit is devised to calculate a variability measure relative to the signal'"'"'s average value, the variability measure being correlated to average blood pressure, and the variability measure is compared in the comparator to an adjustable threshold value corresponding to a specific hemodynamic condition, whereupon the comparator emits an indication signal when the variability measure falls below the threshold value.
67 Citations
10 Claims
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1. A device for detecting hemodynamic conditions of a heart, comprising:
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sensor means for sensing a physiological variable in a living subject and for emitting an electrical signal dependent of said physiological variable, said electrical signal having an average value; signal editing means for editing said electrical signal to produce an edited signal; calculating means supplied with said edited signal for calculating a variability measure of the edited sign related to but different from said average value of said electrical signal and correlated to average blood pressure of said living subject; and comparator means for comparing said variability measure to a threshold selectable dependent on a selected hemodynamic condition, for emitting an indication signal indicating the presence of said selected hemodynamic condition in said living subject when said variability measure falls below said threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification