- Poster presentation
- Open access
- Published:
Bioprosthetic mitral valve effective orifice area using 4D flow cardiac magnetic resonance derived time velocity integral. An in vitro comparison with Doppler Echocardiography
Journal of Cardiovascular Magnetic Resonance volume 17, Article number: P336 (2015)
Background
4D Flow Cardiac Magnetic Resonance (CMR) is a novel imaging modality to assess bioprosthetic mitral valve (BMV) function. We describe a new, 4D Flow derived velocity time integral (TVI) based method to assess effective orifice area (EOA) for BMVs.
Methods
In our MRI-compatible circulatory loop 4 stented porcine BMVs (27, 29, 31, 33mm) underwent CMR with a 1.5T Siemens scanner. The valves were evaluated at forward stroke volumes of 70, 90 and 110ml at a beat rate of 70bpm. We plotted instantaneous peak velocities and calculated TVI for each scenario. 4D CMR-EOA was calculated by dividing the forward stroke volume measured by our high fidelity flow transducers with the calculated TVI. Doppler derived EOA was calculated identically using the Doppler derived TVI.
Results
4D CMR-EOA was successfully calculated in a total number of 12 tests. 4D Flow CMR-EOA revealed a strong correlation when compared with Doppler derived EOA (r=0.985, p<0.001) and the mean difference was -0.1±0.05cm2 between the two methods. Calculated CMR-TVI by our method correlated well with Doppler derived TVI (r=0.99, p<0.001 and mean difference 3.2±1.97cm).
Conclusions
Our study demonstrated the feasibility of 4D Flow CMR to evaluate bioprosthetic valve EOA with the use of velocity encoded CMR data from 4D Flow Software analysis. Our data showed high agreement with Doppler EOA calculations, demonstrating a potential for 4D Flow CMR in bioprosthetic valve evaluation.
Funding
American Heart Association grant #11BGIA5840008.
Figure 1
Author information
Authors and Affiliations
Rights and permissions
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
About this article
Cite this article
Maragiannis, D., Jackson, M., Igo, S. et al. Bioprosthetic mitral valve effective orifice area using 4D flow cardiac magnetic resonance derived time velocity integral. An in vitro comparison with Doppler Echocardiography. J Cardiovasc Magn Reson 17 (Suppl 1), P336 (2015). https://doi.org/10.1186/1532-429X-17-S1-P336
Published:
DOI: https://doi.org/10.1186/1532-429X-17-S1-P336