[Usefulness of biofeedback treatment in children with chronic functional constipation].

About 2/3 of constipated children present anal-rectal dyssynergy (ARD) with paradoxical contraction of the external anal sphincter (EAS) during defecation.The aim of our study was to answer the question whether additional treatment with biofeedback training (BF) is more effective than traditional treatment.We assessed chronically constipated children who fulfilled the criteria of ARD: recto-sigmoid transit time in Hinton's test with radio-paque markers at least 28.8 h, paradoxical EAS contraction during defecation trials (anorectal manometry). The study included 22 constipated children (16 boys and 6 girls), aged 5 to 14 years (mean 8.1 +/- SD 2.8). Children were randomly divided in two groups. In group I at the start of the study children had four day-by-day sessions of BF training based on the anorectal manometry and the surface EMG. Children from group II received only traditional treatment. The follow-up was 6 months. Improvement was estimated based on manometric data, number and quality of stools.In the group I after one month, more manometric parameters, significantly improved as compared to the II group. During the observation period the number of stools increased and their quality improved in both groups. There was no statistically significant difference between the groups in terms of the above mentioned symptoms.Treatment with BF can improve rectal sensation and particularly defecation dynamics, faster than the traditional method. There is no significant effect of additional BF treatment on such objective symptoms as the number and quality of stools.