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Apparatus and method for adjusting heart/pacer relative to changes in venous diameter during exercise to obtain a required cardiac output.

  • US 4,770,177 A
  • Filed: 02/18/1986
  • Issued: 09/13/1988
  • Est. Priority Date: 02/18/1986
  • Status: Expired due to Term
First Claim
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1. An apparatus for pacing a heart in accordance with the heart/pacer rate needed to produce a required cardiac output while a person is exercising, said apparatus acting in response to change in venous blood vessel diameter and comprising:

  • a pacer for implantation in a human body and having a pulse generator and control circuitry including a microprocessor for controlling operation of said pulse generator;

    a pacing lead for implantation in a heart having a tip electrode for engaging and supplying pacing pulses to a right ventricle of a heart;

    means for determining changes in diameter of a vein in the human body; and

    said control circuitry including means for relating the changes in venous blood vessel diameter with the required pacing rate needed to supply a desired cardiac output and means for causing said pacer to pace the heart at the required rate when the heart is not naturally paced.

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