Estimating left ventricular offset volume using dual-frequency conductance catheters

Academic Article

Abstract

  • The measurement of left ventricular volume by the conductance-catheter technique has many advantages, but it is difficult to determine absolute volumes with this method. Current procedure requires that a bolus of concentrated hypertonic saline be injected to measure absolute volume. It also demands that the subject be in a steady state and that measurements only be made at discrete intervals. The saline bolus may affect the cardiovascular state of the subject. This paper describes a new technique for estimating absolute volume utilizing the conductance catheter that relies on the different frequency responses of blood and muscle. Good correlation between the salt-injection method and the dual-frequency method was found in nine-closed-chest pigs anesthetized with pentobarbital sodium (r = 0.922). Further refinements may extend the utility of the dual-frequency approach.
  • Authors

    Digital Object Identifier (doi)

    Author List

  • Gawne TJ; Gray KS; Goldstein RE
  • Start Page

  • 872
  • End Page

  • 876
  • Volume

  • 63
  • Issue

  • 2