[Chronic constipation in children; good results of biofeedback training as supplementary therapy].

In two children with refractory constipation biofeedback training was successfully used as a supplementary therapy. In this treatment, a balloon tied to the end of the catheter is inserted into the rectum and inflated with ever-decreasing amounts of air, so as to increase rectal sensibility. In addition, the defaecation pattern is displayed on a monitor. The child learns to control contraction and relaxation of the musculature involved in defaecation.