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Implantable stimulation device and method for determining a trial autocapture using backup atrial stimulation

  • US 6,259,950 B1
  • Filed: 09/14/1999
  • Issued: 07/10/2001
  • Est. Priority Date: 05/14/1996
  • Status: Expired due to Term
First Claim
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1. A method of determining an atrial capture threshold in a stimulation device having a programmable AV delay, comprising:

  • generating an atrial stimulation pulse while maintaining ventricular stimulation pulse amplitude at a level known to ensure ventricular capture;

    detecting loss of capture of the atrial stimulation pulse; and

    in response to the loss of capture, automatically adjusting the AV delay and delivering a backup atrial stimulation pulse concurrent with a ventricular stimulation pulse, to reduce the possibility of a retrograde P-wave initiating a pacemaker-mediated tachycardia (PMT).

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