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Assessment of bowel control with anorectal manometry after surgery for anorectal malformation
Insights
Bowel function in children after anorectal malformation surgery is linked to anal canal pressure and reflexes. Good outcomes correlate with high resting pressure and recto-anal reflexes, crucial for continence.
Area of Science:
- Pediatric Surgery
- Gastroenterology
- Urology
Background:
- Anorectal malformation (ARM) surgery aims to restore bowel function.
- Assessing long-term functional outcomes is critical for pediatric patients.
Purpose of the Study:
- To evaluate bowel function and anorectal manometry findings in children post-ARM surgery.
- To correlate manometric parameters with clinical outcomes (Kelly's score).
Main Methods:
- Kelly's score assessment in 101 children over 3 years old.
- Anorectal manometry performed on 72 children.
- Comparison of manometric data between functional outcome groups.
Main Results:
- "Good" functional outcome group showed normal resting anal canal pressure and contraction wave frequency.
- Recto-anal reflex present in ~75% of the "good" group.
- "Poor" outcome group had low resting pressure, minimal contraction waves, and no recto-anal reflex.
Conclusions:
- High resting anal canal pressure (>20 cmH2O) and recto-anal reflex are key indicators of good bowel function and continence post-ARM surgery.
- Precise rectal pull-through into the puborectalis muscle is essential for achieving adequate anal canal pressure.
- Anorectal manometry effectively differentiates functional outcomes in children after ARM repair.
Abstract:
Bowel function after surgery for anorectal malformation was assessed by Kelly's score in 101 children over 3 years of age. Seventy-two were examined using anorectal manometry. In the "good" group, resting pressure of the anal canal was as high as in the normal children, and the frequency of contraction waves in the anal canal was the same as in the normal children. Recto-anal reflex was recognized in about three fourths of the "good" group. On the other hand, in the "poor" group resting pressure was low, in only one were contraction waves evident and in none was there a recto-anal reflex. The findings of the anorectal manometry placed the "fair" group between the "good" and the "poor" groups. The clear contraction waves of the anal canal or the clear recto-anal reflex related to a resting pressure in the anal canal of over 20 cmH2O. This high pressure in the anal canal is important for good and continence, and depends on a precise pull-through of the rectum into the puborectalis muscle.