Abstract
The aim was to study and compare the passive biomechanical wall properties in the isolated duodenum and distal ileum of the guinea pigin vitro. The organ bath contained a Krebs-Ringer solution with 10−2 M MgCl2 to abolish smooth muscle contractile activity. Stepwise inflation of an intraluminal balloon, in which the cross-sectional area (CSA) was measured, provided the distension stimulus. The circumferential wall tension-strain distributions and wall stiffness-strain relations were computed from steady-state values of these measurements in order to evaluate the passive elastic properties. The CSA always reached equilibrium within the 2-min distension period. The CSAs obtained in the distal ileum were higher than those in the duodenum (P<0.001). The basal CSA was 17.31±1.14 mm2 and 12.96±0.42 mm2 for the distal ileum and the duodenum, respectively (P<0.01). At a maximum pressure of 6 kPa, the CSA of the ileum was 56.63±1.81 mm2 and 36.86±1.76 mm2 for the duodenum (P<0.01). The circumferential wall tension-strain distributions showed an exponential behavior that accorded well with the equationY=exp(a+bX) with determination coefficients of 0.96±0.01 and 0.99±0.00 in the duodenal segments in the distal ileal segments, respectively. The values ofa (intercept with they-axis) were 0.54±0.11 and −0.35±0.19 for the duodenal and ileal segments, respectively (P<0.001). The slope of the curves (b values) were 4.34±0.35 in the duodenal and 5.23±0.37 in the ileal segments (0.1>P>0.05). In conclusion, differences in elastic properties were found between the proximal and distal small intestine.
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Storkholm, J.H., Villadsen, G.E., Jensen, S.L. et al. Passive elastic wall properties in isolated guinea pig small intestine. Digest Dis Sci 40, 976–982 (1995). https://doi.org/10.1007/BF02064185
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DOI: https://doi.org/10.1007/BF02064185