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Revista Colombiana de Gastroenterologia

Print version ISSN 0120-9957

Abstract

Comentario a: Colangiopancreatografía por resonancia magnética: un metanálisis del desempeño de la prueba en sospecha de enfermedad biliar: Comentario a: Magnetic Resonance Cholangiopancreatography: A Meta-Analysis of Test Performance in Suspected Biliary Disease. Rev Col Gastroenterol [online]. 2004, vol.19, n.2, pp.132-134. ISSN 0120-9957.

Background: Magnetic resonance cholangiopancreatography (MRCP) is one of many newer noninvasive tests that can image the biliary tree. Purpose: To precisely estimate the overall sensitivity and specificity of MRCP in suspected biliary obstruction and to evaluate clinically important subgroups. Data soueces: MEDLINE search (January 1987 to March 2003) for studies in English or French, bibliographies, and subject matter experts. Study selection: Studies were included if they allowed construction of 2x2 contingency tables of MRCP compared with a reasonable gold standard for at least 1 of the following: the presence, level, or cause of biliary obstruction. Data extraction: Two independent observers graded study quality, which included consecutive enrollment, blinding, use of a single (versus composite) gold standard, and nonselective use of the gold standard. Logistic regression was used to examine the influence of publication year, quality score, proportion of patients having a "direct" gold standard, and clinical context on diagnostic performance. Data synthesis: Of 498 studies identified, 67 were included (4711 patients). Mixed-effect models were used to estimate the sensitivity and specificity, and quantitative receiver-operating characteristic analysis was performed. Magnetic resonance cholangiopancreatography had a high overall pooled sensitivity (95% [+/-1.96 SD: spread of SD, 75% to 99%]) and specificity (97% [spread of SD, 86% to 99%]). The procedure was less sensitive for stones (92%; odds ratio, 0.51 [CI, 0.35 to 0.75]) and malignant conditions (88%; odds ratio, 0.28 [CI, 0.18 to 0.44]) than for the presence of obstruction. In addition, diagnostic performance was higher in studies that were larger, did not use consecutive enrollment, and did not use gold standard assessment for some patients. Conclusions Magnetic resonance cholangiopancreatography is a noninvasive imaging test with excellent overall sensitivity and specificity for demonstrating the level and presence of biliary obstruction; however, it seems less sensitive for detecting stones or differentiating malignant from benign obstruction.

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