Physiologic Tests of the Anorectum Masatoshi Oya 1 1Department of Gastroenterological Surgery, Cancer Institate Hospital Keyword: 直腸肛門機能検査 , 肛門内圧測定 , 直腸感覚 , 直腸肛門反射 , defecography pp.1239-1244
Published Date 2003/8/25
DOI https://doi.org/10.11477/mf.1403100768
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 Temporary stool retention in the rectum, prevention of stool leakage by the sphincter mechanism, and timely and sufficient evacuation are important functions of the anorectum. Anorectal physiologic tests aim to evaluate these functions objectively and quantitatively. Anal manometry, anal endosonography, rectal sensory tests, recording of rectoanal inhibitory reflex and defecography are performed commonly in clinical settings. Sphincter electromyography and the measurement of pudendal nerve terminal motor latency are tools for the differential diagnosis of the weakness of the external anal sphincter. Transit study is important in the evaluation of chronic constipation. Although anorectal physiologic tests are clinically useful in a number of anorectal diseases and conditions, the results should be carefully interpreted, with patients' subjective symptoms and organic abnormalities being considered.

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