Apparatus and method of control for an implanted anti-tachycardia device
First Claim
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1. A method of controlling an implanted anti-tachycardia device as a function of a patient'"'"'s heart rhythm, comprising the steps of:
- defining a slow heart rhythm below which there is no ventricular tachycardia, defining a fast heart rhythm above which ventricular fibrillation or fast ventricular tachycardia occur, and defining an intermediary rhythm between said fast and slow rhythms and for which a ventricular tachycardia is suspected;
detecting atrial P wave events and ventricular R wave events;
analyzing the detected P wave and R wave events and determining therefrom a sensed heart rhythm, an acceleration of the ventricular rhythm, an atrioventricular association ratio, an R-R interval between successive R waves, a stability of R-R intervals, a P-R interval between a P wave and the following R wave, an instability of P-R intervals, and a ventricular rhythm;
identifying a heart rhythm corresponding to said intermediary heart rhythm; and
in response theretotriggering said antitachycardia device to provide a preselected programmed therapy in response to one of a first condition or a second condition wherein the first condition includes a determined absence of 1;
1 atrioventricular association, instability of the P-R intervals, and stability of the R-R interval; and
wherein the second condition includes a determined 1;
1 atrioventricular association and acceleration of the ventricular rhythm subsequent to an atrioventricular desynchronization.
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Abstract
Control of an anti-tachycardia device such as a defibrillator to apply a preselected programmed therapy in the event of ventricular tachycardia. The control includes comparison of the atrial and ventricular rhythms, and examination of the criteria of stability of the P-R intervals, of the stability of the R-R intervals, and of the acceleration of the ventricular rhythm subsequent to an atrioventricular desynchronization, thereby to ensure control of the antitachycardia device solely in the event of ventricular tachycardia.
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Citations
6 Claims
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1. A method of controlling an implanted anti-tachycardia device as a function of a patient'"'"'s heart rhythm, comprising the steps of:
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defining a slow heart rhythm below which there is no ventricular tachycardia, defining a fast heart rhythm above which ventricular fibrillation or fast ventricular tachycardia occur, and defining an intermediary rhythm between said fast and slow rhythms and for which a ventricular tachycardia is suspected; detecting atrial P wave events and ventricular R wave events; analyzing the detected P wave and R wave events and determining therefrom a sensed heart rhythm, an acceleration of the ventricular rhythm, an atrioventricular association ratio, an R-R interval between successive R waves, a stability of R-R intervals, a P-R interval between a P wave and the following R wave, an instability of P-R intervals, and a ventricular rhythm; identifying a heart rhythm corresponding to said intermediary heart rhythm; and
in response theretotriggering said antitachycardia device to provide a preselected programmed therapy in response to one of a first condition or a second condition wherein the first condition includes a determined absence of 1;
1 atrioventricular association, instability of the P-R intervals, and stability of the R-R interval; and
wherein the second condition includes a determined 1;
1 atrioventricular association and acceleration of the ventricular rhythm subsequent to an atrioventricular desynchronization. - View Dependent Claims (2, 3)
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4. In an implanted anti-tachycardia device, apparatus for applying a programmed anti-tachycardia therapy to cardiac tissue including circuits for receiving cardiac signals corresponding to atrial P wave and ventricular R wave heart activity comprising:
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means for sensing a heart rhythm, means for determining whether the heart rhythm is one of a slow heart rhythm below which there is no ventricular tachycardia, a fast heart rhythm above which ventricular fibrillation or fast ventricular tachycardia may occur, and an intermediary rhythm between said fast and slow rhythms; means for analyzing said atrial P waves and ventricular R waves and determining therefrom a P-R interval, a P-R interval instability, an R-R interval, an R-R interval stability, an atrioventricular association ratio, a ventricular rhythm, and an acceleration of the ventricular rhythm; and means for triggering the anti-tachycardia device to apply a preselected programmed therapy in response to the determining means determining that there is an intermediary rhythm and in response to the analyzing and determining means determining that there is one of a first condition and a second condition, wherein the first condition includes a determined absence of 1;
1 atrioventricular association, instability of the P-R intervals, and stability of the R-R interval; and
wherein the second condition includes a determined 1;
1 atrioventricular association, and acceleration of the ventricular rhythm subsequent to an atrioventricular desynchronization. - View Dependent Claims (5, 6)
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Specification