Summary
Lumen area, ellipticity, and wall thickness were measured in the aortoiliac bifurcations obtained at autopsy from 14 patients aged between 1 day and 76 years. The method involved freezing pressure-fixed, stained bifurcations on the stage of a refrigerated microtome and then looking at the block face while sections were removed. Area change was normalized over segment length to produce a value of either taper (narrowing, in mm2/mm), or flare (expansion). The aortoiliac bifurcations were divided into three regions based on the area changes: an apical region corresponding to the bifurcation apex (taper = 2.96 ± 0.80 mm2/mm), a preapical region (flare = 3.58 ± 0.87mm2/mm), and the postapical region (flare = 0.82 ± 0.80mm2/mm). Preapical lumen ellipticity showed that the anterioposterior diameter was always less than the lateral diameter, while the degree of ellipticity increased with age. Average circumferential wall thickness, assessed in polar coordinates, decreased between 0° (right lateral) and 120°, while a significant increase in wall thickness was present between 120° and 200°. The most striking difference was found in the 1-day-old, which was very thin posteriorly. This detailed geometric analysis of the aortoiliac bifurcation suggests that taper, flare, and variations in both circumferential and longitudinal wall thickness need to be considered when trying to correlate physical factors in the aorta with the precise location of atherosclerotic lesions and wall remodeling.
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Financial support was provided by the Heart and Stroke Foundation of Ontario, the Terence W. Gilmore Memorial Scholarship, the Medical Research Council of Canada, and the Cadillac Fairview Corporation
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MacLean, N.F., Roach, M.R. Thickness, taper, and ellipticity in the aortoiliac bifurcation of patients aged 1 day to 76 years. Heart Vessels 13, 95–101 (1998). https://doi.org/10.1007/BF01744592
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DOI: https://doi.org/10.1007/BF01744592