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Automatic adjusting R-wave synchronization algorithm for atrial cardioversion and defibrillation

  • US 7,561,913 B2
  • Filed: 04/30/2003
  • Issued: 07/14/2009
  • Est. Priority Date: 04/30/2003
  • Status: Active Grant
First Claim
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1. A method of controlling a therapy in an implantable medical device, comprising:

  • setting a refractory period upper limit;

    setting a lower limit for the refractory period;

    initializing a refractory period to the refractory period upper limit;

    sensing a cardiac signal other than during the refractory period and determining whether to deliver a therapy in response to the cardiac signal;

    determining whether an R-wave synchronization criteria for delivering the therapy are met; and

    thenif the R-wave synchronization criteria are met, delivering the therapy and returning to the sensing step; and

    if the R-wave synchronization criteria are not met, automatically adjusting the refractory period to be less than the refractory period upper limit and return to the sensing step;

    determining whether the refractory period, as adjusted, is less than the lower limit;

    terminating the method in response to the refractory period, as adjusted, being less than the lower limit;

    determining, in response to the refractory period, as adjusted, not being less than the lower limit, whether the R-wave synchronization criteria corresponding to the refractory period, as adjusted, are met for a subsequently sensed cardiac signal;

    delivering the therapy in response to the R-wave synchronization criteria being met for the subsequently sensed cardiac signals; and

    automatically adjusting the refractory period, as adjusted, in response to the R-wave synchronization criteria not being met.

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