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- Open Access
Towards a comprehensive description of relative aortic pressure: insights from 4D flow CMR
© Pitcher et al; licensee BioMed Central Ltd. 2013
- Published: 30 January 2013
- Cardiovascular Magnetic Resonance
- Relative Pressure
- Bicuspid Aortic Valve
- Marfan Syndrome
- Aortic Disease
A complete description of the relative spatiotemporal pressure gradients which drive blood flow has been a central goal of hemodynamics research over six decades. We have previously described a novel computational method for the in vivo estimation of these relative pressure gradients in the human cardiovascular system based on 4D flow Cardiovascular Magnetic Resonance (CMR) datasets (reference 1). We now describe the application of this method to allow a comprehensive assessment of the spatiotemporal distribution of relative pressure in the human aorta, based on 4D flow CMR datasets, in both healthy subjects, and in patients with established aortic disease. We have extended the approach by isolating, and individually analysing, the three major components of relative pressure, providing unique insights into the nature and timing of intra-aortic relative pressure changes.
We describe the time-resolved relative pressure distribution, in healthy subjects, and in those with aortic diseases characterised by aortic dilation, demonstrating that relative pressure distributions are consistent in the healthy aorta but differ in disease. The isolation and separate evaluation of the three components of relative pressure provides further unique insights into the timings and contributions of each component to overall pressure differences, with implications for understanding mechanisms of aortic disease in populations and in individuals, and with potential for guiding choice of therapy in future.
Alex Pitcher and Pablo Lamata contributed equally to this work. Funding support is acknowledged from the European Community's Seventh Framework Program; the Department of Health via the National Institute for Health Research (NIHR) comprehensive Biomedical Research Centre award to Guy's & St Thomas' NHS Foundation Trust in partnership with King's College London and King's College Hospital NHS Foundation Trust (Lamata, Krittian, Nordsletten, Smith), the British Heart Foundation (Pitcher, Bissell), the Oxford NIHR Biomedical Research Centre (Pitcher, Neubauer), and the Oxfordshire Health Services Research Funds (Pitcher, Cassar). Stefan Neubauer and Nic Smith acknowledge support from the BHF Centres of Research Excellence at Oxford and Kings College London respectively.
- Krittian SB, Lamata P, Michler C, Nordsletten DA, Bock J, Bradley CP, Pitcher A, Kilner PJ, Markl M, Smith NP: A finite-element approach to the direct computation of relative cardiovascular pressure from time-resolved MR velocity data. Med Image Anal. 2012, 16 (5): 1029-37. 10.1016/j.media.2012.04.003.View ArticlePubMedGoogle Scholar
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/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.