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Method of determining a ventilatory threshold breakpoint for an adaptive rate pacemaker

  • US 6,411,850 B1
  • Filed: 09/30/1999
  • Issued: 06/25/2002
  • Est. Priority Date: 09/30/1999
  • Status: Expired due to Fees
First Claim
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1. A method for automatically determining the ventilatory threshold breakpoint for adaptive rate pacing without the need for directly measuring anaerobic threshold or ventilatory threshold in a human patient carrying an implanted pacemaker, said method comprising:

  • positioning a first sensing electrode in the heart or superior vena cava of said patient, said first sensing electrode connected to said implanted pacemaker;

    positioning a second sensing electrode in the thoracic region of said patient and spaced apart from said first sensing electrode;

    determining the chest wall impedance of said patient between said first sensing electrode and said second sensing electrode;

    then measuring the ventilation of said subject from said chest wall impedance during submaximal exercise by said patient; and

    then determining the ventilatory threshold breakpoint of said patient from said measured ventilation;

    wherein said determining step is carried out by calculating a parameter from said measured ventilation, said parameter selected from the group consisting of respiratory rate change during submaximal exercise, tidal volume change during submaximal exercise, and tidal volume during steady state submaximal exercise, and then determining said ventilatory threshold breakpoint from said calculated parameter.

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