Intestinal neuromuscular function after preservation and transplantation

Area of Science:

• Gastroenterology
• Transplantation Surgery
• Neurogastroenterology

Background:

• Prolonged preservation of intestinal grafts is known to cause mucosal damage.
• The impact of preservation time on the neuromuscular function of intestinal grafts remains largely uninvestigated.

Purpose of the Study:

• To investigate the effects of immediate versus 24-hour preservation on the neuromuscular function of autotransplanted intestinal grafts.
• To assess the reversibility and recovery patterns of intestinal dysmotility following transplantation.

Main Methods:

• Hound dog small intestine autotransplantation with immediate or 24-hour cold lactated Ringer's solution preservation.
• Assessment of fasting motility and smooth muscle/enteric nerve responses using a multiple strain gauge method.
• Evaluation of responses to bethanechol and cisapride on postoperative days 2, 4, 7, 14, 21, and 28.

Main Results:

• Both immediate and 24-hour preserved grafts showed delayed reappearance of migrating myoelectric complexes (MMC) and reduced responses to bethanechol and cisapride compared to controls.
• The 24-hour preservation group exhibited more abnormal fasting motility and a significantly delayed MMC reappearance (3 weeks vs. 2 days).
• Intestinal dysmotility was transient, normalizing within 3-4 weeks post-transplantation, indicating reversibility.

Conclusions:

• Prolonged intestinal graft preservation exacerbates post-transplant dysmotility compared to immediate transplantation.
• Neuromuscular injury from preservation and reperfusion is reversible and can be mitigated by hypothermia.
• Recovery of intestinal neuromuscular function is achievable within 3-4 weeks, even after extended preservation periods.