System for detection of different types of cardiac events
First Claim
1. A cardiac event detection system for detecting an acute ischemia related cardiac event in a patient comprising:
- (a) at least two electrodes for sensing an electrogram electrical signal from said patient'"'"'s heart, at least one of the electrodes being adapted for implantation into the heart;
(b) an implantable device coupled to said electrodes, said implantable device having an analog-to-digital circuit system contained therein for digitizing said electrogram electrical signal, thereby generating a digitized electrogram;
(c) a processor contained in said implantable device and electrically coupled to said electrodes, said processor including means for detecting ST-segment shifted beats within the digitized electrogram and for computing the heart rate associated with various portions of the digitized electrogram, the processor further including means for detecting a cardiac event based upon both the number of ST-segment shifted beats within a set time period and the heart rate within said set time period such that the number of ST-segment shifted beats required to detect acute ischemia is greater at heart rates above a patient'"'"'s normal or resting heart rate.
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Abstract
A system for the detection of cardiac events occurring in a human patient is provided. At least two electrodes are included in the system for obtaining an electrical signal from a patient'"'"'s heart. An electrical signal processor is electrically coupled to the electrodes for processing the electrical signal and a patient alarm means is further provided and electrically coupled to the electrical signal processor. The electrical signal is acquired in the form of electrogram segments, which are categorized according to heart rate, ST segment shift and type heart rhythm (normal or abnormal). Baseline electrogram segments are tracked over time.
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Citations
9 Claims
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1. A cardiac event detection system for detecting an acute ischemia related cardiac event in a patient comprising:
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(a) at least two electrodes for sensing an electrogram electrical signal from said patient'"'"'s heart, at least one of the electrodes being adapted for implantation into the heart; (b) an implantable device coupled to said electrodes, said implantable device having an analog-to-digital circuit system contained therein for digitizing said electrogram electrical signal, thereby generating a digitized electrogram; (c) a processor contained in said implantable device and electrically coupled to said electrodes, said processor including means for detecting ST-segment shifted beats within the digitized electrogram and for computing the heart rate associated with various portions of the digitized electrogram, the processor further including means for detecting a cardiac event based upon both the number of ST-segment shifted beats within a set time period and the heart rate within said set time period such that the number of ST-segment shifted beats required to detect acute ischemia is greater at heart rates above a patient'"'"'s normal or resting heart rate. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A cardiac event detection system for detecting an acute ischemia related cardiac event in a patient comprising:
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(a) at least two electrodes for sensing an electrogram electrical signal from said patient'"'"'s heart, at least one of the electrodes being adapted for implantation into the heart; (b) an implantable device coupled to said electrodes, said implantable device having an analog-to-digital circuit system contained therein for digitizing said electrogram electrical signal, thereby generating a digitized electrogram; (c) a processor contained in said implantable device and electrically coupled to said electrodes, said processor including means for detecting ST-segment shifted beats within the digitized electrogram and for computing the heart rate associated with various portions of the digitized electrogram, the processor further including means for detecting an acute ischemia related cardiac event based upon both the duration of an ST shift and heart rate, wherein the duration of an ST shift that will trigger detection of the acute ischemia related cardiac event varies according to the polarity of the ST shift. - View Dependent Claims (8, 9)
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Specification