METHOD AND DEVICE FOR MONITORING ACUTE DECOMPENSATED HEART FAILURE
First Claim
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1. An implantable medical device comprising:
- an electrode connecting arrangement connectable to at least two electrodes;
an impedance determiner that determines an impedance signal associated with a heart of a subject over at least a diastolic phase of a heart beat based on electric signals sensed by said at least two electrodes;
a parameter calculator that calculates, based on said impedance signal, an impedance parameter by applying a non-zero first weight to a diastolic portion of said impedance signal corresponding to at least a portion of said diastolic phase of said heart beat and applying a second weight to a non-diastolic portion of said impedance signal corresponding to a non-diastolic phase of said heart beat, said first weight being larger than said second weight; and
an acute decompensated heart failure, ADHF, monitor that monitors an ADHF status based on said impedance parameter.
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Abstract
An implantable medical device has an impedance determiner for determining a cardiogenic impedance signal based on electric signals sensed by connected electrodes. A parameter calculator processes the impedance signal to calculate an impedance parameter representative of the cardiogenic impedance in connection with the diastolic phase of a heart cycle. This parameter is then employed by the device for monitoring acute decompensated heart failure status of a subject.
15 Citations
32 Claims
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1. An implantable medical device comprising:
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an electrode connecting arrangement connectable to at least two electrodes; an impedance determiner that determines an impedance signal associated with a heart of a subject over at least a diastolic phase of a heart beat based on electric signals sensed by said at least two electrodes; a parameter calculator that calculates, based on said impedance signal, an impedance parameter by applying a non-zero first weight to a diastolic portion of said impedance signal corresponding to at least a portion of said diastolic phase of said heart beat and applying a second weight to a non-diastolic portion of said impedance signal corresponding to a non-diastolic phase of said heart beat, said first weight being larger than said second weight; and an acute decompensated heart failure, ADHF, monitor that monitors an ADHF status based on said impedance parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 20, 21, 22, 23, 24, 25, 26, 31, 32)
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18. (canceled)
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27. A method of monitoring an acute decompensated heart failure as an ADHF status in a subject comprising the steps of:
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determining an impedance signal representative of the impedance associated with a heart of said subject over at least a diastolic phase of a heart beat; in a computerized processor, calculating, based on said impedance signal, an impedance parameter by applying a non-zero first weight to a diastolic portion of said impedance signal corresponding to at least a portion of said diastolic phase of said heart beat and applying a second weight to a non-diastolic portion of said impedance signal (20, 30) corresponding to a non-diastolic phase of said heart beat, said first weight being larger than said second weight; and in said processor, automatically monitoring said ADHF status based on said impedance parameter. - View Dependent Claims (28, 29, 30)
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Specification