The predictive value of colon transit time and anorectal manometry in the approach of faecal continence in children with spina bifida.

Purpose: The aim of this study is to analyse colon transit time (CTT) and anorectal manometry (ARM) in children with spina bifida (SB) as a predictor for achieving spontaneous faecal continence.

Methods: SB patients (2.5-7 years old) followed at the SB Reference Centre Ghent University Hospital underwent CTT and/or ARM before starting bowel management. A standardized questionnaire about the presence of constipation and faecal incontinence was completed. CTT was measured using a 6-day pellet abdominal X-ray method. ARM was performed in nonsedated children using a latex-free catheter.

Results: Twenty-two patients were studied, with a median age of 4.57 years. They all underwent a CTT study, 17 (77%) also agreed to ARM. 10/22 patients (45.5%) were constipated. 5/22 patients (22.7%) became spontaneously continent, 10/22 (45.5%) became pseudocontinent with bowel management, the others remained incontinent. SB patients had a significant prolonged CTT compared to healthy controls. In the group with an abnormal CTT study (12 patients), none of the patients developed faecal continence spontaneously, irrespective of the ARM result. In case of a normal CTT study (10 patients), 7 agreed to ARM. All children with normal resting pressure (4 patients) gained continence spontaneously. The 3 children with abnormal low resting pressure remained incontinent.

Conclusions: This prospective study confirms the predictive value of normal CTT and normal resting pressure, in the evolution towards spontaneous faecal continence. If CTT is abnormal, irrespective of the ARM, bowel management will be necessary to obtain pseudo-continence. In these cases, ARM is not a designated examination.