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Circuit for monitoring a heart and for effecting cardioversion of a needy heart

  • US 4,184,493 A
  • Filed: 02/15/1978
  • Issued: 01/22/1980
  • Est. Priority Date: 09/30/1975
  • Status: Expired due to Term
First Claim
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1. A circuit for detecting the state of a heart by monitoring the continuous time average of the ratio of high slope to low slope ECG segments and for effecting cardioversion if a malfunction is indicated by such time average ratio exceeding a predetermined threshold, the circuit comprising:

  • ECG monitor means for sensing ECG signals from a heart;

    signal shaping means for generating the slope of the sensed ECG signals by providing an approximation of the derivative of the input ECG;

    means for discriminating between high slope and low slope segments;

    averaging means for continuously time averaging the ratio of high slope to low slope segments;

    threshold means for determining whether such time average ratio of high slope to low slope segments is within predetermined threshold limits indicative of normalcy; and

    means for effecting cardioversion if said ratio is outside said threshold.

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