Mucosal alterations in experimentally induced small intestinal strangulation obstruction in ponies

Area of Science:

• Veterinary Pathology
• Gastroenterology
• Surgical Research

Background:

• Small intestinal strangulation obstruction (ISO) is a critical condition in equids.
• Understanding the precise sequence of tissue damage in ISO is crucial for timely intervention.

Purpose of the Study:

• To investigate the histopathological changes in the small intestine following induced strangulation obstruction in ponies.
• To correlate gross pathological findings with microscopic degeneration patterns.

Main Methods:

• Seven ponies underwent arteriovenous ligation to induce ISO under anesthesia.
• Positive-pressure ventilation maintained target arterial PCO2.
• Biopsy samples were analyzed using histopathology and scanning electron microscopy.
• Degeneration was graded (0-V) and compared with gross intestinal characteristics.

Main Results:

• Mucosal degeneration initiated at the villus tip, progressing towards the villus base.
• Lamina propria degeneration followed mucosal damage.
• Histopathological changes persisted even after ligature release and restoration of perfusion/motility.

Conclusions:

• The study elucidates the sequential histopathological damage in equine ISO.
• Early mucosal damage at the villus tip is a key feature.
• Tissue damage progression continues post-reperfusion, highlighting the severity of ISO.