Alteration in intestinal morphologic features associated with extensive large-colon resection in horses

Area of Science:

• Veterinary surgery
• Gastrointestinal physiology
• Equine medicine

Background:

• Large colon resection in horses can lead to significant gastrointestinal changes.
• Understanding mucosal adaptation post-resection is crucial for equine health management.

Purpose of the Study:

• To investigate the long-term mucosal morphologic adaptations of the equine intestine after extensive large-colon resection.
• To compare intestinal morphology between horses that underwent large-colon resection and those that had a sham operation.

Main Methods:

• Light microscopy, morphometry, and scanning electron microscopy were employed.
• Intestinal specimens were collected one year after surgery from horses undergoing sham operation or large-colon resection.
• Morphometric analysis focused on intercrypt area, distance, crypt area, and depth.

Main Results:

• Morphometry revealed significantly greater intercrypt area and distance in horses with colon resection, particularly in the cecum and remaining right colon (P < 0.05).
• Scanning electron microscopy showed more prominent crypt orifices in the large intestine of horses post-resection.
• No significant differences in small intestinal morphology or crypt dimensions were detected between groups.

Conclusions:

• Horses demonstrate significant adaptation to extensive large-colon resection within one year.
• The adaptation involves an increase in the absorptive (intercrypt) surface area of the remaining large intestine.
• These findings highlight the large intestine's capacity to compensate for major surgical alterations.