Evaluation of the anal sphincter function by vector manometry in congenital anorectal malformation

Objective: To evaluate the anal sphincter function of congenital anorectal malforotation retrospectively.Methods: With continuous pull through technique, the manometry of 22 congenital anorectal malforotation patients and 24 controls were studied and the results were analysed with their clinical scores. Results: Anal resting pressure in the children with neurogenic anorectum induced by myelodysplasia(21.3±3.4) mmHg was lower than that in normal children(66.7±24.0) mmHg.The maximum contractive pressure of anus in the patients(22.4±3.3) mmHg was lower than that in normal children(129.0±18.8) mmHg. The length of high pressure zone in the patients(12.3±4.6 mm) was lower than that in normal children(23.6±4.6 mm). Rectoanal inhibitory reflex was identified in both patients and normal children. Conclusion:Anorectal manometry might be an effective parameter to evaluate the anal sphincter function of congenital anorectal malformation.