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Process of controlling a dual chamber cardiac pacemaker

  • US 5,713,928 A
  • Filed: 07/25/1996
  • Issued: 02/03/1998
  • Est. Priority Date: 07/25/1995
  • Status: Expired due to Term
First Claim
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1. A process of controlling a dual chamber cardiac pacemaker operable to sense atrial and ventricular depolarizations, to stimulate an atrium and a ventricle, and to determine an atrial rhythm based on an interval between successive sensed atrial depolarizations and having a fallback mode of de-synchronization of a ventricular stimulation when the atrial rhythm exceeds an allowable level, and a mode of progressive re-synchronization in case of a return of the atrial rhythm to the allowable level comprising:

  • (a) sensing an atrial depolarization, defining a window of Detection of the Acceleration of the Atrial Rhythm (DAAR) in response to a sensed atrial depolarization, said DAAR having a duration that is a function of a preceding determined atrial rhythm, and further comprising at least one of the preceding intervals between successive sensed atrial depolarizations;

    (b) sensing a next atrial depolarization, and in response thereto, starting a delay of an Atrial Escape Interval (AEI); and

    (c) determining if said next sensed atrial depolarization has occurred in the defined DAAR window duration, and commanding if necessary a following atrial stimulation according to the started AEI delay,wherein the method step (a) further comprises adapting the duration of the DAAR window as a function of the preceding atrial rhythm and selecting a first DAAR window duration for a rapid atrial rhythm and a second DAAR window duration for a slow atrial rhythm, and discriminating between atrial extrasystoles (AES) and a physiological acceleration of the atrial rhythm based on said selected DAAR window duration.

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