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Apparatus and method of control for an implanted anti-tachycardia device

  • US 5,350,406 A
  • Filed: 12/22/1992
  • Issued: 09/27/1994
  • Est. Priority Date: 12/31/1991
  • Status: Expired due to Term
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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