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Rate adaptive pacemaker using impedance measurements and stroke volume calculations

  • US 6,975,903 B1
  • Filed: 03/23/2000
  • Issued: 12/13/2005
  • Est. Priority Date: 03/31/1999
  • Status: Expired due to Fees
First Claim
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1. A rate adaptive pacemaker comprising:

  • an arrangement adapted for interaction with a subject for obtaining an electrical signal representing cardiac demand of said subject;

    a computing unit supplied with said signal for calculating an actual cardiac output CO, and a cardiac output COrest for said subject at rest;

    a pacing rate controller also supplied with said signal for generating, as an output, a pacing rate dependent on said cardiac demand; and

    a pacing rate limiter connected to said computing unit and to said pacing rate controller for downwardly limiting said pacing rate, said pacing rate limiter calculating a stroke volume SV and a stroke volume SVrest for said subject at rest, and downwardly limiting said pacing rate so that a first predetermined relation CO>

    COrest and a second predetermined relation SV/SVrest<

    L are satisfied, wherein L is a predetermined constant in a range between 1.2 and 1.5.

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