Psyllium Fiber Versus Placebo in Early Treatment After STARR for Obstructed Defecation: a Double-blind RCT

Inclusion Criteria: * Written informed consent * Age over 18 * Diagnosis of Obstructed Defecation Syndrome according to ODS and CCS Score * STARR performed when ODS score \>10 * STARR performed 48-72 hours before Exclusion Criteria: * Puborectalis or sphincter dyssynergia, evaluated by defecography and / or anorectal manometry * Concomitant diseases (fissure, abscess, fistula, IBD, diverticular disease) * Prolapse of other pelvic floor organs * Proctological surgery before STARR * Pregnancy or breast-feeding * Ongoing treatment with oral anticoagulants or steroid therapy * Conditions that do not allow patients to understand the nature and the purpose of the study