BACKGROUND: constipation is a complex problem and precise diagnosis is required for adequate therapy. When treating patients with obstructed defecation, many factors as gender, age, personal habits, childbirth, associated diseases and other specific pelvic disorders must be considered. Manometry is the preferred diagnosis method due to its simplicity and general availability. OBJECTIVE: the aim of this work was to determine rectal and anal pressures in patients with outlet constipation. METHOD: forty patients diagnosed with outlet constipation were examined using manometry by Coloproctology Ambulatory of Santa Casa of São Paulo. The results were compared with a control group of 60 normal. Rectal and anal pressures were measured by ballon manometry , with the patients grouped by type of constipation. RESULTS: we observed alterations in rectal and anal resting and anal squeese pressures in constipated individuals, but no pressure differences between the various types of constipation. CONCLUSION: the different diagnostic methods are relevant for a correct diagnosis. Although baloon manometry should be one of these procedures, it should not be used as the only diagnosis method.
constipation; outlet constipation; manometry; anal pressure
