A novel ultrasound technique to estimate right ventricular geometry during fibrillation.

Published

Journal Article

Finite element modelling of the heart for the purpose of studying the electric fields of defibrillation shocks requires knowledge of the geometry of the heart during fibrillation. However, the standard method of measuring this geometry, MRI. cannot be used during fibrillation because the heart geometry changes rapidly and perhaps unpredictably. We present a new ultrasound approach to measuring the right ventricular geometry during fibrillation and preliminary data using this technique. In six anaesthetized pigs, we find that a short axis cross-sectional area of the right ventricle increases by 38% during a 30 s episode of ventricular fibrillation. A long axis cross-sectional area increases by 19% during this same time. By fitting parameters of a simple geometric model to the experimental data, we estimate that the volume of blood in the right ventricular cavity increases by approximately 30% during the episode of ventricular fibrillation. We present the first study of the RV area during-fibrillation with the estimated volume. Our data suggest changes in defibrillation threshold may be linked to current shunting through the increased blood volume.

Full Text

Duke Authors

Cited Authors

  • Eason, J; Gades, NM; Malkin, RA

Published Date

  • May 2002

Published In

Volume / Issue

  • 23 / 2

Start / End Page

  • 269 - 278

PubMed ID

  • 12051299

Pubmed Central ID

  • 12051299

Electronic International Standard Serial Number (EISSN)

  • 1361-6579

International Standard Serial Number (ISSN)

  • 0967-3334

Digital Object Identifier (DOI)

  • 10.1088/0967-3334/23/2/303

Language

  • eng