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Postoperative Ileus Murine Model

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INTESTINAL OBSTRUCTION : AN EXPERIMENTAL STUDY OF THE INTOXICATION IN CLOSED INTESTINAL LOOPS.

L R Dragstedt¹, J J Moorhead, F W Burcky

¹Hull Physiological Laboratory of the University of Chicago, Chicago.

The Journal of Experimental Medicine

|October 30, 2009

Summary

Closed intestinal loops are compatible with life when bacteria are absent or tissue necrosis is prevented. Bacterial activity and necrotic tissue absorption are key factors in mortality, not normal duodenal or jejunal secretions.

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Area of Science:

Gastroenterology
Surgical Research
Microbiology

Background:

Understanding the factors contributing to mortality in closed intestinal loops is crucial for surgical and medical interventions.
Previous theories regarding toxic duodenal or jejunal secretions have been proposed but lacked definitive evidence.

Purpose of the Study:

To investigate the viability of closed intestinal loops under various conditions, specifically assessing the roles of bacteria, tissue necrosis, and normal secretions.
To evaluate the validity of existing theories on toxic mucosal secretions in the duodenum and jejunum.

Main Methods:

Creation of closed intestinal loops in experimental models.
Manipulation of bacterial presence and prevention of tissue necrosis.
Occlusion of blood supply to assess viability.
Analysis of duodenal and jejunal secretions and their effects when drained into the abdominal cavity.

Main Results:

Closed intestinal loops are compatible with life when bacteria are removed or when bacteria are present without tissue necrosis.
Complete occlusion of blood supply in closed aseptic loops is compatible with life.
Normal duodenal and jejunal secretions are not toxic enough to cause symptoms when released into the abdominal cavity.
The study refutes theories of normal toxic duodenal secretion neutralized by the jejunum or perverted secretion theories.

Conclusions:

Bacterial activity in conjunction with necrotic tissue is the primary determinant of rapid death in simple closed intestinal loops.
The absorption of toxic products from putrefactive bacteria acting on necrotic tissue is the critical lethal factor.
Normal gastrointestinal secretions do not appear to be inherently toxic in this context.