Respiratory parameters for arrhythmia detection and therapy
First Claim
1. An implantable or other ambulatory medical apparatus comprising:
- a cardiac signal sensing circuit configured to provide a sensed cardiac depolarization signal of a heart of a subject;
a respiration sensing circuit configured to provide a signal representative of respiration of the subject; and
a control circuit communicatively coupled to the cardiac signal sensing circuit and the respiration circuit, wherein the control circuit includes a tachyarrhythmia detection circuit configured to;
determine heart rate using the depolarization signal;
determine a respiration parameter of the subject using the respiration signal;
calculate a ratio of the determined heart rate and the determined respiration parameter and determine a normal baseline value of the ratio;
generate an indication of tachyarrhythmia when the calculated ratio satisfies a ventricular tachycardia ratio detection zone, wherein a value of the calculated ratio of the ventricular tachycardia detection zone is a substantial increase over the normal baseline value of the ratio; and
provide the indication of tachyarrhythmia to a user or process.
1 Assignment
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Accused Products
Abstract
An implantable or ambulatory medical device can include a cardiac signal sensing circuit configured to provide a sensed cardiac depolarization signal of a heart of a subject, a respiration sensing circuit configured to provide a signal representative of respiration of the subject, and a control circuit communicatively coupled to the cardiac signal sensing circuit and the respiration circuit. The control circuit includes a tachyarrhythmia detection circuit configured to determine heart rate using the depolarization signal, determine a respiration parameter of the subject using the respiration signal, calculate a ratio using the determined heart rate and the determined respiration parameter, generate an indication of tachyarrhythmia when the calculated ratio satisfies a specified detection ratio threshold value, and provide the indication of tachyarrhythmia to a user or process.
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Citations
11 Claims
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1. An implantable or other ambulatory medical apparatus comprising:
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a cardiac signal sensing circuit configured to provide a sensed cardiac depolarization signal of a heart of a subject; a respiration sensing circuit configured to provide a signal representative of respiration of the subject; and a control circuit communicatively coupled to the cardiac signal sensing circuit and the respiration circuit, wherein the control circuit includes a tachyarrhythmia detection circuit configured to; determine heart rate using the depolarization signal; determine a respiration parameter of the subject using the respiration signal; calculate a ratio of the determined heart rate and the determined respiration parameter and determine a normal baseline value of the ratio; generate an indication of tachyarrhythmia when the calculated ratio satisfies a ventricular tachycardia ratio detection zone, wherein a value of the calculated ratio of the ventricular tachycardia detection zone is a substantial increase over the normal baseline value of the ratio; and provide the indication of tachyarrhythmia to a user or process. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification