Nonlinear conductance-volume relationship for murine conductance catheter measurement system

Chia Ling Wei, Jonathan W. Valvano, Marc D. Feldman, John A. Pearce

Research output: Contribution to journalArticlepeer-review

49 Scopus citations


The conductance catheter system is a tool to determine instantaneous left ventricular volume in vivo by converting measured conductance to volume. The currently adopted conductance-to-volume conversion equation was proposed by Baan, and the accuracy of this equation is limited by the assumption of a linear conductance-volume relationship. The electric field generated by a conductance catheter is nonuniform, which results in a nonlinear relationship between conductance and volume. This paper investigates this nonlinear relationship and proposes a new nonlinear conductance-to-volume conversion equation. The proposed nonlinear equation uses a single empirically determined calibration coefficient, derived from independently measured stroke volume. In vitro experiments and numerical model simulations were performed to verify and validate the proposed equation.

Original languageEnglish (US)
Pages (from-to)1654-1661
Number of pages8
JournalIEEE Transactions on Biomedical Engineering
Issue number10
StatePublished - Oct 2005


  • Conductance catheter
  • Conductance-volume relationship
  • Volume estimation

ASJC Scopus subject areas

  • Biomedical Engineering


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