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Related Experiment Video

Updated: Jul 4, 2026

Multimodality Diagnosis of Mesenteric Ischemia
05:07

Multimodality Diagnosis of Mesenteric Ischemia

Published on: July 21, 2023

Orthogonal polarization spectroscopy to detect mesenteric hypoperfusion.

Hendrik Bracht1, Vladimir Krejci, Luzius Hiltebrand

  • 1Department of Intensive Care Medicine, Bern University Hospital and University of Bern, Inselspital, CH-3010 Bern, Switzerland.

Intensive Care Medicine
|June 3, 2008
PubMed
Summary

Orthogonal polarization spectral imaging showed high variability in assessing jejunal mucosal microcirculation. It detected reduced blood flow only at very low levels, indicating limitations in sensitivity for mesenteric blood flow reduction.

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Area of Science:

  • Gastroenterology
  • Microcirculation Research
  • Medical Imaging Technology

Background:

  • Orthogonal polarization spectral (OPS) imaging is a tool for assessing mucosal microcirculation.
  • Evaluating the sensitivity and variability of OPS in detecting reductions in mesenteric blood flow (Qsma) is crucial for its clinical application.

Purpose of the Study:

  • To test the sensitivity and variability of OPS imaging in assessing reductions in mesenteric blood flow (Qsma).
  • To compare OPS imaging with laser Doppler flowmetry in evaluating jejunal mucosal microcirculation.

Main Methods:

  • Eight pigs underwent stepwise reduction of Qsma by 15% from baseline, with five control animals.
  • Jejunal mucosal microcirculation was recorded using OPS and laser Doppler flowmetry.
  • Two blinded investigators quantified capillary density and perfused villi from randomly ordered OPS images.

Main Results:

  • High interobserver (0.34) and intraobserver (0.10) coefficients of variation were found for capillary density.
  • Capillary density changes were inconsistently observed, and significant differences were not detected compared to controls.
  • Reduction in perfused villi was detected only at 75% Qsma reduction; laser Doppler showed heterogeneous perfusion.

Conclusions:

  • Capillary density assessment using OPS did not reliably detect Qsma reduction.
  • Evaluation of perfused villi showed reduced blood flow only at very low Qsma levels.
  • High interobserver variability and potential issues with image contrast limit OPS efficacy in assessing gut mucosal microcirculation.