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      Wall Thickness to Lumen Diameter Ratios of Arteries from SHR and WKY: Comparison of Pressurised and Wire-Mounted Preparations


      Journal of Vascular Research

      S. Karger AG

      Wall structure, Hypertension, Vascular hypertrophy, Mesenteric arteries, SHR, Remodelling

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          Passive properties (diameter, wall-to-lumen ratio and axial length) of small mesenteric arteries from SHR and WKY rats were measured with the artery segments cannulated and pressurised, or mounted on wires in a myograph. The measurements were made with a range of distending pressures (or calculated equivalent distending pressures when wire-mounted) from 0 to 180 mm Hg. The axial length of artery segments increased with increasing distending pressure when cannulated, but not when wire-mounted. The axial extension was greater for arteries from WKY (up to 105 %) than for arteries from SHR (up to 65%). The arteries from SHR had significantly smaller diameters and greater wall-to-lumen ratios than the arteries from WKY. However, the diameters calculated for the arteries when wire-mounted were less than the measured diameters, and the wall-to-lumen ratio was always greater when wire-mounted than when cannulated because of the underestimated diameter and the absence of axial extension. Wall-to-lumen ratios decreased with increased distending pressure; values at 180 mm Hg were only 18 and 25 % of those at 0 mm Hg for WKY and SHR arteries, respectively. The large degree of variability of wall-to-lumen ratios obtained from the two different preparations and the large range of values that are obtained from a single artery at different distending pressures must call into question the validity of characterising vascular hypertrophy by any single estimation of this parameter.

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          Author and article information

          J Vasc Res
          Journal of Vascular Research
          S. Karger AG
          23 September 2008
          : 29
          : 6
          : 435-442
          Baker Medical Research Institute, Prahran, Australia
          158962 J Vasc Res 1992;29:435–442
          © 1992 S. Karger AG, Basel

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          Page count
          Pages: 8
          Research Paper


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