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Scintigraphic Assessment of Neorectal Motor Function

Department of Surgery, Gastroenterology Unit, and Section of Diagnostic Nuclear Medicine, Mayo Clinic and Foundation, Rochester, Minnesota

Correspondence: For reprints contact: Manuel L. Brown, MD, Dept. of Nuclear Medicine, Mayo Clinic, Rochester, MN 55905.

ABSTRACT

Colectomy, mucosal rectectomy, and ileal pouch-anal anastomosis have become alternatives to proctocolectomy and ileostomy for patients with ulcerative colitis or polyposis coli. The aim of this study was to develop a scintigraphic technique for assessment of the "neorectal" motor function of such patients. An artificial stool, consisting of a 7.5% dispersion of aluminum magnesium silicate in water, was labeled with 1 mCi [^99mTc]sulfur colloid and instilled into the neorectum. Static pre- and postevacuation scans and dynamic acquisition scans during evacuation were taken with the patient seated on a commode. The imaging provided good anatomic definition of the pouch and quantitated the usual rate and percentage of neorectal evacuation at about 10 ml stool/sec and 60% of instilled stool, respectively. This technique appeared to be a safe, simple, useful tool for assessing the neorectal motor function of patients with ileal pouch-anal anastomosis.

FOOTNOTES

^* A portion of this work was presented at the 32nd Annual Meeting of The Society of Nuclear Medicine, Houston, Texas, June 3, 1985.

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