Abstract | BACKGROUND: The aim of this study was to evaluate the accuracy of hydrogen peroxide-enhanced ultrasound in localizing the internal opening of the anal fistula. METHODS: A retrospective review of all patients with anal fistula who underwent hydrogen peroxide-enhanced ultrasound was performed. The results of hydrogen peroxideenhanced ultrasound and intraoperative findings on the basis of operative reports were correlated. RESULTS: A total of 57 patients (47 men) of mean age of 45.7 (range, 21-77) years underwent hydrogen peroxide-enhanced ultrasound with a diagnosis of anal fistula; 36 patients underwent surgery. The intraoperative internal opening correlated with the hydrogen peroxide-enhanced ultrasound report in 22 of 36 patients (61.1%). In 5 patients, the hydrogen peroxide-enhanced ultrasound yielded false-positive information with a positive predictive value of 84%. Four of the 7 patients with falsenegative hydrogen peroxide-enhanced ultrasound findings had supra- and extrasphincteric fistulas. CONCLUSIONS: There is a 61.1% correlation between hydrogen peroxide-enhanced ultrasound and surgical findings of the internal opening with a positive predictive value of 84%. If no internal opening was seen on hydrogen peroxide-enhanced ultrasound, it strongly suggests the possibility of a supralevator or extrasphincteric fistula.
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Authors | I Moscowitz, M K Baig, J J Nogueras, E Ovalioglu, E G Weiss, J J Singh, S D Wexner |
Journal | Techniques in coloproctology
(Tech Coloproctol)
Vol. 7
Issue 3
Pg. 133-7
(Oct 2003)
ISSN: 1123-6337 [Print] Italy |
PMID | 14628155
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Contrast Media
- Hydrogen Peroxide
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Topics |
- Adult
- Aged
- Contrast Media
- Female
- Humans
- Hydrogen Peroxide
- Male
- Middle Aged
- Rectal Fistula
(diagnostic imaging, surgery)
- Retrospective Studies
- Sensitivity and Specificity
- Ultrasonography
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