Prospective randomized trial comparing four biofeedback techniques for patients with constipation Author: Heymen S//Wexner SD//Vickers D//Nogueras JJ//// Conference/Journal: Diseases of the Colon & Rectum Date published: 1999 Other: Volume ID: 42 , Issue ID: 22 , Pages: 1388-93 , Word Count: 36 Thirty-six patients were randomly assigned to one of four biofeedback protocols. All four treatments were effective in increasing unassisted bowel movements and/or reducing the use of cathartics. No significant difference was found among the treatments.