Digestive Diseases and Sciences

, Volume 53, Issue 2, pp 413–420

Spontaneous and Bolus-induced Motility in the Chronically Obstructed Guinea-Pig Small Intestine In vitro

  • Jan Henrik Storkholm
  • Jingbo Zhao
  • Gerda E. Villadsen
  • Hans Gregersen
Original Paper

DOI: 10.1007/s10620-007-9865-6

Cite this article as:
Storkholm, J.H., Zhao, J., Villadsen, G.E. et al. Dig Dis Sci (2008) 53: 413. doi:10.1007/s10620-007-9865-6

Abstract

Partial obstruction of the small intestine results in dysmotility and morphometric changes proximal to the site of obstruction. However, our understanding of the relation between the morphometric remodeling and change in the motility pattern during chronic obstruction is sparse. The aim of this study was to investigate the effect of partial chronic intestinal obstruction on motility, morphology, and collagen content proximal and distal to the site of obstruction. Twenty guinea-pigs with partial intestinal obstruction and eight sham-operated controls lived for four weeks. Spontaneous and bolus-induced motility was recorded in isolated intestinal segments proximal and distal to the site of obstruction using a perfused low-compliance pressure-measuring system in vitro. After the motility experiments, the specimens were fixed at 2 kPa luminal distension pressure and sampled for histomorphometric determination of luminal radius, layer thickness, and wall thickness. Total wall collagen was also determined. The area under the curve (AUC) of spontaneous contractions and the amplitude, frequency, and AUC for the bolus-induced motility were higher in the proximal segments of the banded animals compared to distal segments and to the intestinal segments in the control animals (P < 0.05). The radius-to-thickness ratio was lowest in the proximal segments of the obstructed animals (P < 0.01). The collagen content was three times higher proximal to the site of obstruction when compared to distal locations and to the controls (P < 0.01). The AUC at 2 ml bolus injections plotted against the radius-to-thickness ratio showed a strong association (r = 0.97 for control, and r = 0.99 for obstruction, P < 0.01). No correlation was found between the collagen content and AUC. In conclusion, partial intestinal obstruction in guinea pigs caused pronounced changes in morphology and motility. An association was found between the radius-to-thickness ratio and bolus-induced motility.

Keywords

Jejunum Partial obstruction Motility Collagen content 

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Jan Henrik Storkholm
    • 1
    • 2
  • Jingbo Zhao
    • 1
    • 5
  • Gerda E. Villadsen
    • 2
  • Hans Gregersen
    • 1
    • 3
    • 4
  1. 1.Center of Excellence in Visceral Biomechanics and PainAalborg HospitalAalborgDenmark
  2. 2.Clinical InstituteAarhus UniversityAarhusDenmark
  3. 3.La Jolla Bioengineering InstituteLa JollaUSA
  4. 4.Department of Mechanical EngineeringITTTallaght, DublinIreland
  5. 5.Center of Excellence in Visceral Biomechanics and PainAalborg Hospital Science and Innovation CenterAalborgDenmark

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