Detection of renal failure by cardiac implantable medical device
First Claim
1. An implantable medical system for detecting renal failure comprising:
- at least one lead comprising an electrode configured for placement within a patient in electrical contact with the patient'"'"'s heart and operative to sense intracardiac electrograms;
an implantable medical device adapted to be connected to the at least one lead and comprising;
a tracking unit that tracks two different intervals between QRS complexes and corresponding T waves for each of at least two different PQRST complexes within an intracardiac electrogram sensed by the at least one lead; and
a renal failure detection unit that detects renal failure if each of the two different intervals decrease by a respective amount, wherein the renal failure detection unit calculates a renal failure burden representative of a proportion of time renal failure is detected.
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Accused Products
Abstract
Morphological features within electrical cardiac signals are tracked and feature changes are monitored to detect renal failure. The morphological feature may be an interval between corresponding polarization events such as the interval between QRS-complexes and peaks of corresponding T-waves (QTmax interval); the interval between QRS-complexes and ends of corresponding T-waves (QTend interval); or the interval between P-waves and corresponding QRS-complexes (PR interval). The feature may also be the elevation of a cardiac signal segment between corresponding polarization events, such as QRS-complexes and corresponding T-waves (ST segment); a duration of a polarization event, such as a QRS-complex (QRS width); or an amplitude of a polarization event, such as a T-wave (T-wave amplitude). The change in the feature may comprise a decrease in QTmax intervals, a decrease in QTend intervals, a deviation in ST segment elevation, an increase in QRS width, an increase in PR interval or a deviation in T-wave amplitude.
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Citations
9 Claims
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1. An implantable medical system for detecting renal failure comprising:
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at least one lead comprising an electrode configured for placement within a patient in electrical contact with the patient'"'"'s heart and operative to sense intracardiac electrograms; an implantable medical device adapted to be connected to the at least one lead and comprising; a tracking unit that tracks two different intervals between QRS complexes and corresponding T waves for each of at least two different PQRST complexes within an intracardiac electrogram sensed by the at least one lead; and a renal failure detection unit that detects renal failure if each of the two different intervals decrease by a respective amount, wherein the renal failure detection unit calculates a renal failure burden representative of a proportion of time renal failure is detected. - View Dependent Claims (2, 3, 4)
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5. An implantable medical system for detecting renal failure comprising:
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at least one lead comprising an electrode configured for placement within a patient in electrical contact with the patient'"'"'s heart and operative to sense intracardiac electrograms; an implantable medical device adapted to be connected to the at least one lead and comprising; a tracking unit that tracks two different intervals between QRS complexes and corresponding T waves for each of at least two different PQRST complexes within an intracardiac electrogram sensed by the at least one lead, wherein the tracking unit also tracks at least one other morphological feature, distinct from the two different intervals, for each of the at least two different PQRST complexes within an intracardiac electrogram sensed by the lead; and a renal failure detection unit that detects renal failure if each of the two different intervals decrease by a respective amount and the at least one other morphological feature changes. - View Dependent Claims (6, 7, 8, 9)
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Specification