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Updated: May 4, 2026

Intestinal Stem Cell Isolation and Culture in a Porcine Model of Segmental Small Intestinal Ischemia
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Gut ischaemia

U Haglund1

  • 1Department of Surgery, University Hospital, Uppsala, Sweden.

Gut
|January 1, 1994
PubMed
Summary
This summary is machine-generated.

Hypoxic injury can occur in the gut despite adaptive mechanisms due to villi anatomy. Enteral nutrition may mitigate intestinal mucosal injury, but further trials are needed.

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Area of Science:

  • Gastroenterology
  • Physiology
  • Pathology

Background:

  • Intestinal mucosal injury from ischemia is characterized by increased gut permeability and later abnormalities.
  • Local adaptive mechanisms can tolerate up to 50% blood flow reduction, seen in septic shock or cardiac tamponade.
  • Vascular anatomy of villi can lead to regional hypoxia at the villus tip during low blood flow.

Purpose of the Study:

  • To explain the mechanisms of hypoxic injury in the intestinal mucosa.
  • To investigate the role of reperfusion injury and luminal factors in mucosal damage.
  • To evaluate the potential benefits of enteral nutrition in ischemic intestine.

Main Methods:

  • Review of existing literature on intestinal ischemia and mucosal injury.
  • Discussion of physiological adaptive mechanisms and their limitations.
  • Consideration of factors contributing to reperfusion injury, including free radicals and pancreatic proteases.

Main Results:

  • Regional hypoxia can occur paradoxically at the villus tip due to oxygen shunting in villi vasculature.
  • Reperfusion injury severity correlates with the duration of preceding hypoxia.
  • Free radical generation and luminal factors like pancreatic proteases contribute to mucosal damage.
  • Studies suggest pancreatic duct ligation delays but doesn't prevent gut reperfusion injury.

Conclusions:

  • Enteral nutrition may benefit patients with ischemic intestine by improving regional blood flow and reducing mucosal injury compared to total parenteral nutrition.
  • Further randomized trials are necessary to confirm the benefits of enteral nutrition.
  • Tonometry could be a useful tool for monitoring local ischemia and resolving clinical questions.