Implantable cardiac device providing rapid pacing T wave alternan pattern detection and method
First Claim
1. An implantable cardiac device comprising:
- a T wave alternan pattern monitor that detects overdrive paced T wave alternan patterns and high rate intrinsic T wave alternan patterns; and
a therapy control that initiates a first responsive therapy when an overdrive paced T wave alternan pattern is detected and a second responsive therapy different from the first responsive therapy when a high rate intrinsic T wave alternan pattern is detected.
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Accused Products
Abstract
An implantable cardiac device that delivers electrical therapy to a patient'"'"'s heart determines if a T wave alternan pattern of the patient'"'"'s heart exists. The device includes a sensing circuit that generates an electrical signal including T waves representing paced electrical activity of the heart and a morphology detector that measures a metric of each T wave in the electrical signal. A T wave alternan pattern detector determines, responsive to the measured T wave metrics, if a paced activity T wave alternan pattern is present. The T wave alternan pattern detector may also detect for intrinsic T wave alternan patterns. A therapy control initiates suitable different responses for a paced T wave alternan pattern detection and an intrinsic T wave alternan pattern detection.
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Citations
13 Claims
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1. An implantable cardiac device comprising:
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a T wave alternan pattern monitor that detects overdrive paced T wave alternan patterns and high rate intrinsic T wave alternan patterns; and a therapy control that initiates a first responsive therapy when an overdrive paced T wave alternan pattern is detected and a second responsive therapy different from the first responsive therapy when a high rate intrinsic T wave alternan pattern is detected.
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2. A method comprising:
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detecting one of either overdrive paced T wave alternan patterns or high rate intrinsic T wave alternan patterns using an implantable cardiac device; initiating a first responsive therapy when an overdrive paced T wave alternan pattern is detected; and initiating a second responsive therapy different from the first responsive therapy when a high rate intrinsic T wave alternan pattern is detected. - View Dependent Claims (3, 4, 5, 6)
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7. An implantable cardiac stimulation device comprising:
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a heart rate measuring circuit operative to measure the intrinsic heart rate of a heart having a normal heart rate at rest; a pulse generator operative to apply pacing pulses to the heart; means for detecting the presence of T-wave alternans; and a processor operative to initiate an overdrive paced T-wave analysis by the T-wave alternans detecting means by periodically overdrive pacing the heart for a period of time if the intrinsic rate is below a set high-rate intrinsic rate that is above the normal heart rate, and to initiate an high-rate intrinsic T-wave analysis, different then the overdrive paced T-wave analysis, if the intrinsic rate is above the set high-rate intrinsic rate. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification