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Automatic adjustment of detection rate threshold in an implantable antitachycardia therapy device

  • US 5,882,352 A
  • Filed: 05/25/1995
  • Issued: 03/16/1999
  • Est. Priority Date: 05/25/1995
  • Status: Expired due to Term
First Claim
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1. An implantable antitachycardia stimulation device comprising:

  • pulse generating means for generating stimulation pulses to a patient'"'"'s heart;

    sensing means for sensing cardiac activity of the patient'"'"'s heart;

    first physiologic sensing means for sensing a physiologic parameter indicative of a normal heart rate, and for generating a first sensor signal representative of the sensed physiologic parameter;

    control means, coupled to the pulse generating means, the sensing means, and the first physiological sensing means, for providing a prescribed antitachycardia therapy through the pulse generating means and for terminating a sensed cardiac arrhythmia, the control means including;

    rate detection means for detecting the heart rate of the patient based on the cardiac activity sensed through the sensing means;

    threshold means for generating at least two rate zone thresholds, a low rate zone threshold signal and a high rate zone threshold signal, the low rate zone threshold signal being a function of the first sensor signal, and the high rate zone threshold signal being a prescribed amount greater than the low rate zone threshold signal at least one rate zone threshold signal as a function of the first sensor signal; and

    comparator means for comparing the detected heart rate with the at least one rate zone threshold signal, for determining when the heart rate exceeds the at least one rate zone threshold signal, and for indicating that a cardiac arrhythmia is present.

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