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Method and apparatus for accurate counting of paced heartbeats

  • US 5,771,898 A
  • Filed: 12/19/1996
  • Issued: 06/30/1998
  • Est. Priority Date: 12/19/1996
  • Status: Expired due to Term
First Claim
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1. A heartrate monitor including a QRS detector for detecting QRS complexes in the presence of pacemaker pulses, comprising:

  • a signal receiver adapted for being coupled to at least one sensor coupled to a medical patient, for providing an ECG signal and a pacemaker detection signal;

    a pacemaker activity checker, responsive to said pacemaker detection signal and said ECG signal for providing first and second output signals, said first output signal indicating the occurrence of a QRS complex in the vicinity of the pacemaker detection signal, and the second output signal indicating the occurrence of an overshoot in the vicinity of the pacemaker detection signal;

    an overshoot validator, responsive to said ECG signals and said second output signal for indicating the validity of the indicated overshoot;

    a QRS detector, responsive to said ECG signal, for indicating the occurrence of a QRS complex in said ECG signal;

    a logic combining means, responsive to at least said first output signal, the output of said overshoot validator and the output of said QRS detector, for determining a combined QRS detection signal; and

    heartrate determining means responsive to said combined QRS detection signal for indicating a heartrate for the medical patient.

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