Manometry of Anorectal

Manometry of Anorectal free pdf ebook was written by on April 22, 2004 consist of 6 page(s). The pdf file is provided by www.mssurg.net and available on pdfpedia since September 10, 2011.

ano-rectal manometry the ano-rectum the normal function is storage and release of..(s2- 4) nervous systems. the internal anal sphincter is innervated with sympathetic..a constant state of contraction. the external anal sphincter is skeletal...

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Manometry of Anorectal pdf




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Manometry of Anorectal  - page 1
ANO-RECTAL MANOMETRY THE ANO-RECTUM The normal function is storage and release of intestinal waste products. The volume of the rectum is 650-1200mL. The innervation of the rectum is via the sympathetic (L1-3) and parasympathetic (S2- 4) nervous systems. The internal anal sphincter is innervated with sympathetic and parasympathetic fibers. Both are inhibitory and keep the sphincter in a constant state of contraction. The external anal sphincter is skeletal muscles innervated by the pudendal nerve with fibers from S2-4. ELEMENTS OF ANORECTAL MANOMETRY (I) Ano-rectal manometry measures the resting & pressures generated by the sphincter complex of the anus. Resting Pressure is 85% internal anal sphincter + 15% external anal sphincter, (normally 40-80mmHg) Voluntary Squeeze Pressure is 100% due to the external anal sphincter, (normally 80-160mmHg) The test measures pressure gradients all along the anal canal both radially and longitudinally. ELEMENTS OF ANORECTAL MANOMETRY (II) Sphincter length (usually 3cm) & symmetry Minimum Sensory Volume (usually 10-15mL) Determined by instilling volume into rectal balloon until sensed by urge to defecate Resting Anal Inhibitory Reflex (RAIR)- corresponds to a decrease resting pressure attributed to balloon distension in the high pressure zone (HPZ) with an associated EAS contraction. USE OF ANORECTAL MANOMETRY Ano-rectal manometry can define hypo/hyperfunctional disorders of the sphincter complex Manometry can compare objective function with patient’s subjective sensation of rectal fullness Often performed in conjunction with other clinical and diagnostic modalities: DRE, video defecography, and anal manometry with EMG. 246
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Manometry of Anorectal  - page 2
INDICATIONS Fecal Incontinence Constipation Pre/Post Surgical Evaluation Other Functional Anorectal Pain Pelvic Floor Dyssynergia Hirschsprung' Disease s TECHNIQUE AND PROCEDURE May bowel prep 2-4 hours prior to test Insert solid state or water-perfused probe with radial transducers or ports Allow return to baseline pressure (~5 min) Patient asked to squeeze, relax, and strain while pressures are measured within the anal canal 247
Manometry of Anorectal  - page 3
TECHNIQUE AND PROCEDURE 248
Manometry of Anorectal  - page 4
NORMAL MANOMETRIC TRACING 249
Manometry of Anorectal  - page 5
ANOMANOMETRIC FINDINGS SEEN WITH SPECIFIC DISEASES Clinical situation Resting P (IAS) Normal A. Normal (good tone) B. Fecal Incontinence (multiple etiologies) 1.Overflow incontinence d/t: Low a. rectal fecal impaction - decreased sensation - obtuse anorectal angle - chronic stimulation of RAIR b. neoplasm 2. Abnormal pelvic floor d/t: Low a. neurogenic causes - pudendal nerve disruption/weakness - neuropathy (dm, scleroderma, multiple sclerosis) - generalized neuropathy or cord lesion b. sphincter disruption - obstetrical trauma - surgical trauma - trauma (other) C. Constipation Low Low +/- Squeezing P (EAS) High Low Pushing P Low Low RAIR + + -The extent of the P drop can often correspond to the extent of disease/debilitation -RAIR difficult to assess given low resting and squeezing pressures -It is often helpful if not essential to utilize EMG studies to evaluate neurogenic causes of fecal incontinence, although diagnosis can often be made on history alone. Comments Normal High High D. Hirshsprung’s Low Low Low _ In the absence of obstructive pathology, failure for sphincter relaxation during pushing often contributes to constipation. Negative RAIR is pathognomonic for Hirshsprung’s 250
Manometry of Anorectal  - page 6
OTHER ASSESSMENT TOOLS Sphincterography: analyzes EAS muscle contraction and relaxation radiographically, using a flexible balloon connected to liquid barium. Defecography: radiographically assesses the shape and postion of the rectum as it empties. Pudendal nerve studies EMG Anal ultrasonography REFERENCES 1. Madhulika G. Varma M.D., Robert D. Madoff M.D. “Fecal Incontinence.” Clinics in Colon and Rectal Surgery 2001; 253-264. 2. Wexner SD, Jorge JM. “Colorectal physiological tests: use or abuse of technology?” European Journal of Surgery. 1994 March; 160(3); 167-74. 3. Schiller, Lawrence. “Fecal Incontinence.” From: Feldman: Sleisenger & Fordtran’s Gastrointestinal and Liver Disease, 7 th ed. Copyright 2002 Elsevier; 164-5. 4. Sun WM, Donnelly TC, Read NW. “Utility of a combined test of anorectal manometry, electromyography, and sensation in determining the mechanism of ‘idiopathic; faecal incontinence.” Gut 1992; 33; 807-813. 5. Manometry tracing:http://www.myotonicdystrophy.org/Anorectal%20Mamometry.htm 6. Manometry apparatus: http://www.racs.edu.au/about/presentations/RVarcoe_1603.ppt Rachel B. Wellner MD 251
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