Accuracy considerations in catheter based estimation of left ventricular volume.

John A. Pearce, John E. Porterfield, Erik R. Larson, Jonathan W. Valvano, Marc D. Feldman

Research output: Contribution to journalArticle

Abstract

Cardiac volume estimation in the Left Ventricle from impedance or admittance measurement is subject to two major sources of error: parallel current pathways in surrounding tissues and a non uniform current density field. The accuracy of volume estimation can be enhanced by incorporating the complex electrical properties of myocardium to identify the muscle component in the measurement and by including the transient nature of the field non uniformity. Cardiac muscle is unique in that the permittivity is high enough at audio frequencies to make the muscle component of the signal identifiable in the imaginary part of an admittance measurement. The muscle contribution can thus be uniquely identified and removed from the combined muscle - blood measurement. In general, both error sources are transient and are best removed in real time as data are collected. This paper reviews error correction methods and establishes that the relative magnitudes of the error concerns are different in small and large hearts.

Original languageEnglish (US)
Pages (from-to)3556-3558
Number of pages3
JournalConference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference
StatePublished - 2010
Externally publishedYes

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Catheters
Muscle
Muscles
Myocardium
Research Design
Cardiac Volume
Electric Impedance
Heart Ventricles
Error correction
Electric properties
Blood
Permittivity
Current density
Tissue

ASJC Scopus subject areas

  • Computer Vision and Pattern Recognition
  • Signal Processing
  • Biomedical Engineering
  • Health Informatics

Cite this

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