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Capture verification method and apparatus for implantable pacemaker utilizing heart rhythm stability measurements to minimize the likelihood of fusion

  • US 5,766,229 A
  • Filed: 04/14/1997
  • Issued: 06/16/1998
  • Est. Priority Date: 04/15/1996
  • Status: Expired due to Term
First Claim
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1. A capture verification method for use with an implantable stimulation device, comprising the steps of:

  • (a) operating the implantable stimulation device in a demand mode at a set stimulation pulse energy, the demand mode including sensing a patient'"'"'s cardiac rhythm and inhibiting a stimulation pulse in the presence of an intrinsic cardiac signal;

    (b) measuring the stability of the cardiac rhythm;

    (c) determining, based on the stability measuring step, a shortened cycle length that is likely to exceed the cardiac rhythm;

    (d) adjusting a current pacing cycle length to the shortened cycle length for at least one cardiac cycle; and

    (e) in the event the set stimulation pulse is delivered, determining capture threshold at the shortened cycle length.

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