Normal Anal Sensibility in Patients Born With Anorectal Malformations

Area of Science:

• Colorectal Surgery
• Neuro-Urology
• Pediatric Surgery

Background:

• Anorectal Malformations (ARM) represent a spectrum of congenital conditions affecting the distal rectum and anus.
• Restoration of anal function, including sensibility and continence, remains a significant challenge in ARM management.
• The role of the internal anal sphincter (IAS) and its innervation in preserving anal function post-ARM repair is not fully elucidated.

Purpose of the Study:

• To investigate the presence and determinants of normal anal sensibility in patients with Anorectal Malformations (ARM) following corrective surgery.
• To evaluate the impact of preserving the internal anal sphincter (IAS) on postoperative anal sensibility.
• To explore the neural regulation of anal sensibility in the context of ARM.

Main Methods:

• Retrospective analysis of ARM patients who underwent corrective surgery.
• Assessment of anal sensibility using standardized sensory testing.
• Correlation of anal sensibility outcomes with IAS integrity and surgical techniques.
• Histological examination of neural structures in resected tissue.

Main Results:

• Normal anal sensibility was observed in a subset of ARM patients post-surgery across various ARM types.
• Patients with a functional IAS demonstrated significantly better anal sensibility.
• Sparing the IAS, particularly when located distally to the fistula, was associated with improved anal sensibility.
• Evidence suggests that transmural nerves play a crucial role in regulating anal sensibility.

Conclusions:

• Postoperative anal sensibility is attainable in ARM patients, emphasizing the importance of surgical strategy.
• Preservation of the internal anal sphincter (IAS) is critical for optimizing anal sensibility and fecal continence after ARM repair.
• Targeting transmural nerves during surgical intervention may be key to preserving anal sensory function.