Faecal urgency and faecal incontinence in patients with ulcerative colitis [UC] cannot always be explained by the presence of mucosal inflammation. We report two cases of patients diagnosed with UC with mucosal healing, who developed faecal urgency and faecal incontinence secondary to rectal hypersensitivity.A 40-year-old man was diagnosed with left-sided UC in 2005. After a step-up therapeutic approach, the remission of disease was finally induced with infliximab. After 3 years in remission, the patient complained of faecal incontinence. After a colonoscopy, disease activity was ruled out. Anorectal manometry was performed and revealed that both the sensation of urgency to defaecate and the maximum tolerable volume were below the reference values. The patient was diagnosed with rectal hypersensitivity. As symptoms might be worsened by the administration of rectal 5-aminosalicylic acid [ASA], the rectal treatment was stopped and the faecal symptoms disappeared.A-56-year-old man was diagnosed with UC in 2005 and started azathioprine in 2008 owing to cortico-dependency. After 2 years in remission, he complained of faecal urgency and faecal incontinence. A colonoscopy revealed quiescent disease. Anorectal manometry was performed and showed that the maximum tolerable volume was below the reference values and that the rectal sensory threshold was decreased. The patient was diagnosed with rectal hypersensitivity. Treatment with amitriptyline 25 mg/day was started and, after 6 months of treatment, the patient became asymptomatic.Patients with UC may have colonic motility dysfunction that can play an important role in the genesis of symptoms.1 Rectal sensation is an important factor in the defaecatory process. Distension of the rectum initiates rectal wall contractions and creates a desire to defaecate. Anorectal dysfunction is a form of colonic dysmotility that produces faecal urgency and faecal incontinence in patients with quiescent UC, even in the absence of disease activity and inflammation.2 This should be suspected in patients who complain about these symptoms despite having a normal endoscopy. It is thought that rectal hypersensitivity may be responsible for the heightened perception of rectal filling and this may act as a trigger for faecal urgency. There are a few options for the management of rectal hypersensitivity, that include biofeedback or pharmacological treatment such as loperamide or tricyclic antidepressants. 4 Amitriptyline is a tricyclic antidepressant and it is believed that this drug decreases pain ratings in response to rectal distension by reducing activation of a specific area of the brain that is activated during painful rectal distention.
5In conclusion, anorectal hypersensitivity is a rectal dysfunction that can be present in patients with UC. It should be suspected when symptoms such as faecal urgency and faecal incontinence persist after ruling out disease activity, in order to provide appropriate treatment to the patient and to improve both their symptoms and their quality of life.
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