Pediatric functional constipation treatment with Bifi dobacterium-containing yogurt：A crossover,double-blind,controlled trial

AIM： To evaluate the treatment of pediatric functional chronic intestinal constipation （FCIC） with a probiotic goat yogurt. METHODS： A crossover double-blind formula-controlled trial was carried out on 59 students （age range： 5-15 years） of a public school in Belo Horizonte, MG, Brazil, presenting a FCIC diagnostic, according to Roma Ⅲ criteria. The students were randomized in two groups to receive a goat yogurt supplemented with 109 colony forming unit/mL Bifidobacterium longum （B.longum） （probiotic） daily or only the yogurt for a period of 5 wk （formula）. Afterwards, the groups were intercrossed for another 5 wk. Defecation frequency, stool consistency and abdominal and defecation pain were assessed.RESULTS： Both treatment groups demonstrated improvement in defecation frequency compared to baseline. However, the group treated with probiotic showed most signif icant improvement in the f irst phase of the study. An inversion was observed after crossing over, resulting in a reduction in stool frequency when this group was treated by formula. Probiotic and formula improved stool consistency in the f irst phase of treatment, but the improvement obtained with probiotic was significantly higher （P = 0.03）. In the second phase of treatment, the group initially treated with probiotic showed worseningstool consistency when using formula. However, the difference was not signif icant. A signif icant improvement in abdominal pain and defecation pain was observed with both probiotic and formula in the first phase of treatment, but again the improvement was more signif icant for the group treated with B. longum during phase I （P 〈 0.05）. When all data of the crossover study were analyzed, significant differences were observed between probiotic yogurt and yogurt only for defecation frequency （P = 0.012）, defecation pain （P = 0.046） and abdominal pain （P = 0.015）.