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Implantable pacemaker including means and method of terminating a pacemaker-mediated tachycardia during rate adaptive pacing

  • US 5,228,438 A
  • Filed: 10/08/1991
  • Issued: 07/20/1993
  • Est. Priority Date: 10/08/1991
  • Status: Expired due to Term
First Claim
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1. An implantable pacemaker including means for terminating a pacemaker-mediated tachycardia (PMT) comprising:

  • detection means within said implantable pacemaker for detecting heart rate and for detecting P-waves and V-pulses and for detecting a prescribed sequence of cardiac cycles, each cardiac cycle of said prescribed sequence comprising a P-wave followed by a V-pulse, the time interval between said P-wave and said V-pulse of each cardiac cycle comprising a P-V interval (PVI), a time interval between successive V-pulses comprising a V-V interval, the detection means further comprising means for timing a timed atrial pulse from a detected P-wave occurring in a corresponding one of the cycles in the sequence of cardiac cycles; and

    stimulation means responsive to the detection means for stimulating the atrium by said timed atrial pulse for terminating a PMT.

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