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Disorders Of Colonic And Anorectal Function Notes

Medicine Notes > Gastrointestinal (GI) System Notes

This is an extract of our Disorders Of Colonic And Anorectal Function document, which we sell as part of our Gastrointestinal (GI) System Notes collection written by the top tier of Bristol University students.

The following is a more accessble plain text extract of the PDF sample above, taken from our Gastrointestinal (GI) System Notes. Due to the challenges of extracting text from PDFs, it will have odd formatting:

Lecture 20 Disorder of colonic and anorectal function





Colonic function o Absorbs water- 1L into caecum- 100ml in stool o Storage o Mass peristalsis o Nutritional role Anorectal function and anatomy o Rectal reservoir o Internal anal sphincter/External anal sphincter o Puborectalis o Pudendal nerve Constipation o General
? Range of BM 3/day- 1/3 days
? Variable- history important
? Infrequent BM
? Straining Passage of hard stool o Signs
? Examination may be unhelpful
? General signs- Myxoedema
? Loaded colon on abdo palpation
? PR presence of large amount of stool o Investigation
? Rules out organic disease (e.g. obstruction); metabolic disorders
? Colonic transit
? Anorectal physiology
? Proctography o Slow transit constipation
? Exceedingly rare
? May be associated with visceral myopathy/neuropathy
? If visceral myopathy=small bowel transit problems Evacuatory disorders o Epi
? Predominately females
? Parous (given birth) middle aged
? Young nulliparous o Types
? Outlet obstruction

* Prolonged straining at stool

* Spending hours on toilet
? Normal/slow transit constipation
? Pelvic floor dysfunction
? Obstructed defecation
? Paradoxical pelvic floor contraction
? Anismus

* Normal response to decrease activity in EAS and puborectalis

* Anismus- increased recruitment of striated muscle in pelvic floor
? Dysfunctional defecation

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