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CMR assessment of normal aortic bioelastic function in children
© Voges et al; licensee BioMed Central Ltd. 2010
Published: 21 January 2010
The bioelastic properties of the aorta may serve as pathogenesis markers in cardiovascular disease. Aortic distensibility and aortic pulse wave velocity (PWV) are two parameters closely tied to the bioelastic function of the aorta. Quantification of these parameters by CMR is accurate and reproducible and could help to identify early cardiovascular disease in asymptomatic patients. However, normal values for healthy children are lacking.
To establish reference values of aortic distensibility and PWV in healthy children using CMR
Twenty-four heart-healthy children (age 9 ± 3.6, range 2.3-17.8 years) were examined using a 3.0 T MRI scanner (Achieva 3.0 T X-series, Philips Medical Systems). We performed gradient echo cine MRI (FOV 280 × 224 mm, voxel size 1.88 × 1.94 × 6 mm, TR = 4.4 ms, TE = 2.5 ms, flip angle: 15°) and phase-contrast MRI (FOV 270 × 270 mm, voxel size 1.64 × 1.4 × 7 mm, TR = 4.4 ms, TE = 2.7 ms, velocity encoding (VENC) = 200 cm/s). Aortic distensibility was calculated for four levels of the thoracic aorta according to the following formula: Distensibility = (Amax - Amin)/[Amin x (Pmax - Pmin)]; A = cross-sectional aortic lumen area, P = blood pressure. Aortic flow measurements in the ascending and proximal descending aorta were used to assess PWV in the aortic arch. PWV was calculated as the ratio of the distance between the ascending and proximal descending aorta and the time delay of the distal flow curve compared to the proximal flow curve.
Reference values for aortic distensibility and pulse wave velocity level 1 = at the isthmus of the aorta, level 2 = above the diaphragm
Values (mean ± SD)
Distensibility (10 -3 mm Hg -1 )
11.9 ± 6.22
9.83 ± 3.92
-descending aorta (level 1)
9.88 ± 5.79
-descending aorta (level 2)
10.93 ± 5.47
3.26 ± 0.53
This study provides reference values for aortic distensibility and pulse wave velocity in children between their 3rd and 18th year of life. These data may serve as a reference for the early detection of pathological changes of the aorta in cardiovascular disease.
This article is published under license to BioMed Central Ltd.