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Correlation between cardiac catheterization and contrast enhanced MRI in pulmonary artery stenosis
© Valverde et al; licensee BioMed Central Ltd. 2010
Published: 21 January 2010
Peripheral pulmonary artery stenosis (PPAS) is present in 2-3% of all congenital heart defects. Catheter interventions guided by conventional X-ray angiography (XRA) have replaced cardiac surgery in the management of PPAS. However, X-ray exposure has negative health effects. Interventional XRA would benefit from non-ionizing and non-invasive planning using contrast enhanced magnetic resonance imaging (CE-MRI) due to its multi-planar capability, but the correlation of images in the two modalities is not always perfect, possibly due to different projections or time delays in capture.
The goal of this study was to evaluate the correlation between XRA and CE-MRI in patients with pulmonary artery stenosis. The first hypothesis is that CE-MRI measurements of PPAS with the same angulations used in XRA (CE-MRIXRA) correlate well with XRA measurements. The second hypothesis is that there is a change in correlation if CE-MRI is performed using the conventional cross-sectional view of the vessel (CE-MRIcross) compared with XRA.
Median and ranges expressed in mm. of every observer (columns) and the difference measurements perfomed in each localization (rows). Statistic differences between the difference techniques measurements (rows) in the difference localizations (rows) expressed as p value.
Mean and (ranges) in mm
Pulmonary artery stenosis
Vessel diameter 1 cm distal to the stenosis
Vessel diameter 1 cm proximal to the stenosis
Distance from bifurcation to stenosis
CE-MRI is a valuable tool for planning interventions for pulmonary artery stenosis. CE-MRIcross is not only a more accurate technique for measuring the diameter of the vessel, compared with the oblique angulations used in XRA, but it also provides two diameters of the vessel. This could be useful for future studies and standard measurements in which the stent size could be chosen according to the cross sectional area of the vessel rather than the minimal diameter acquired in only one XRA projection.
This article is published under license to BioMed Central Ltd.