System for the detection of cardiac events
First Claim
1. A system for assessing cardiac function, the system comprising:
- (a) means for receiving a first plurality of user input ST segment and PQ segment offset times and durations and receiving a corresponding plurality of R-R interval ranges, wherein each of the ST and PQ segment offset times specifies an offset time from an R wave peak for one of the R-R interval ranges;
(b) electrical circuitry means for determining an R-R interval between a prior beat and a current beat, thereby generating a current R-R interval;
(c) processor means for determining an R wave peak of the current beat;
(d) processor means for selecting both a current beat PQ offset time and duration, and a current beat ST offset time and duration from the user input PQ and ST offset and duration times according to the current R-R interval;
(e) processor means for computing ST-segment deviation of the current beat as equal to an average value of an ST segment of the current beat minus an average value of a PQ segment of the current beat, wherein the average values of the ST and PQ segments are based on the current beat ST and current beat PQ segment offset times and durations;
(f) means for determining a baseline ST deviation value; and
,(g) processor means for assessing cardiac function based upon the difference between the baseline ST deviation value and the ST-segment deviation of the current beat.
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Abstract
Disclosed is a system for the detection of cardiac events (a guardian system) that includes an implanted device called a cardiosaver, a physician'"'"'s programmer and an external alarm system. The system is designed to provide early detection of cardiac events such as acute myocardial infarction or exercise induced myocardial ischemia caused by an increased heart rate or exertion. The system can also alert the patient with a less urgent alarm if a heart arrhythmia is detected. Using one or more detection algorithms, the cardiosaver can detect a change in the patient'"'"'s electrogram that is indicative of a cardiac event within five minutes after it occurs and then automatically warn the patient that the event is occurring. To provide this warning, the guardian system includes an internal alarm sub-system (internal alarm means) within the cardiosaver and/or an external alarm system (external alarm means). If the guardian system is put into a pacemaker, the algorithm can utilize a different analysis of the electrogram depending on whether or not the pacemaker is actually pacing the heart.
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Citations
2 Claims
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1. A system for assessing cardiac function, the system comprising:
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(a) means for receiving a first plurality of user input ST segment and PQ segment offset times and durations and receiving a corresponding plurality of R-R interval ranges, wherein each of the ST and PQ segment offset times specifies an offset time from an R wave peak for one of the R-R interval ranges; (b) electrical circuitry means for determining an R-R interval between a prior beat and a current beat, thereby generating a current R-R interval; (c) processor means for determining an R wave peak of the current beat; (d) processor means for selecting both a current beat PQ offset time and duration, and a current beat ST offset time and duration from the user input PQ and ST offset and duration times according to the current R-R interval; (e) processor means for computing ST-segment deviation of the current beat as equal to an average value of an ST segment of the current beat minus an average value of a PQ segment of the current beat, wherein the average values of the ST and PQ segments are based on the current beat ST and current beat PQ segment offset times and durations; (f) means for determining a baseline ST deviation value; and
,(g) processor means for assessing cardiac function based upon the difference between the baseline ST deviation value and the ST-segment deviation of the current beat. - View Dependent Claims (2)
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Specification