Annals of Biomedical Engineering

, Volume 38, Issue 12, pp 3674–3687

Right Ventricular Inefficiency in Repaired Tetralogy of Fallot: Proof of Concept for Energy Calculations From Cardiac MRI Data

  • Ashish Das
  • Rupak K. Banerjee
  • William M. Gottliebson
Article

DOI: 10.1007/s10439-010-0107-2

Cite this article as:
Das, A., Banerjee, R.K. & Gottliebson, W.M. Ann Biomed Eng (2010) 38: 3674. doi:10.1007/s10439-010-0107-2

Abstract

Repaired tetralogy of Fallot (rTOF) patients develop right ventricular (RV) dilatation and dysfunction. To prevent their demise, pulmonary valve replacement is necessary, though appropriate timing for it is challenged by a paucity of reliable diagnostic parameters. In this pilot study, we hypothesized that stroke work (SW) and energy calculations would delineate the inefficiency of RV performance in rTOF. RV SW was calculated for both an rTOF and a normal subject by utilizing RV pressure and volume measurements obtained during cardiac catheterization and MRI studies. Energy transfer rate and ratio were computed at the main pulmonary artery (PA). Compared to the normal RV, the rTOF RV had higher operating pressure, lower computed SW (0.078 J vs. 0.115 J for normal), and higher negative energy transfer at the PA (0.044 J vs. 0.002 J for normal). Furthermore, the energy transfer ratio was nearly twice as high for the normal RV (1.06) as for the rTOF RV (0.56). RV SW and energy transfer ratio delineate important operational efficiency differences in blood flow from the RV to the PA between rTOF and normal subjects. Our pilot data suggest that the rTOF RV is significantly less efficient than normal.

Keywords

Right ventricular stroke workTetralogy of FallotPulmonary insufficiencyPhase contrast MRI

Copyright information

© Biomedical Engineering Society 2010

Authors and Affiliations

  • Ashish Das
    • 1
  • Rupak K. Banerjee
    • 1
    • 2
  • William M. Gottliebson
    • 2
    • 3
  1. 1.Department of Mechanical EngineeringUniversity of CincinnatiCincinnatiUSA
  2. 2.Department of Biomedical EngineeringUniversity of CincinnatiCincinnatiUSA
  3. 3.The Heart InstituteCincinnati Children’s Hospital Medical CenterCincinnatiUSA