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Antitachyarrythmia pacemaker using pre-ejection period to distinguish physiologic from pathologic tachycardia

  • US 4,865,036 A
  • Filed: 06/10/1988
  • Issued: 09/12/1989
  • Est. Priority Date: 06/10/1988
  • Status: Expired due to Term
First Claim
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1. Apparatus for detecting tachycardia in a living subject for initiating cardioversion means when determined to be pathologic rather than physiologic in nature, comprising:

  • (a) means for measuring the pulse rate of a beating heart and developing a first control signal value proportional thereto;

    (b) means for comparing said first control signal value to a pre-established heart rate value for said subject and developing a second control signal value when said first control signal value exceeds said pre-established heart rate value;

    (c) means for sensing the pre-ejection period of said subject'"'"'s heart and developing a third control signal value proportional thereto;

    (d) means for comparing said third control signal value with a fourth control signal value proportional to a rate corrected pre-ejection period value of said subject'"'"'s heart based upon its current heart rate and producing a fifth control signal value when said third control signal value exceeds said fourth control signal value; and

    (e) means for sensing coincidence of said second and fifth control signal values for initiation of said cardioversion means.

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