The usefulness of preoperative endosonographic differentiation of low and high anal fistula
Journal Title: Postępy Nauk Medycznych - Year 2013, Vol 26, Issue 8
Abstract
Introduction. Preoperative determination of the fistula is of great importance in the selection of treatment and the risk of postoperative incontinence. High transsphincteric and intersphincteric fistulas, suprasphincteric fistulas, branching ones, including horseshoe ones and front fistulas in women are associated with an increased risk of complications related to treatment.Aim. The aim of this study was to determine the sensitivity and specificity of endosonographic examinations (EUS – endoanal ultrasound) to determine the type of the original canal and the location of anal fistula.Material and methods. The material was a group of 424 patients, including 132 women and 292 men with a mean age of 45.8 years, operated because of anal fistula in the period from 1 December 2008 to 8 April 2011. A retrospective study of 424 preoperative EUS examinations and operational protocols in the same patients was conducted. The compatibility of the assessment of fistulas in terms of type of canal and its original location was verified.Results. In EUS examinations 63.1% low fistulas and 36.9% high fistulas were determined, and intraoperatively, respectively 57.6 and 42.2% of fistulas (in 0.2% of cases plural fistula was determined). EUS compliance with the state of the intraoperative assessment of the fistula was obtained in 344 cases (84.3%). The sensitivity and specificity of this method in the evaluation of fistulas were respectively 75 and 91%.Conclusions. EUS is a good additional examination for the determination of the fistula location, regardless of its type. The sensitivity and specificity of the method in the assessment of fistula is respectively 75 and 91%.
Authors and Affiliations
Aneta Obcowska, Małgorzata Kołodziejczak, Iwona Sudoł-Szopińska
Keywords
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