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Validation of a tool predicting important findings on computed tomography among Crohn's disease patients.

Govani SM, Waljee AK, Kocher KE, Swoger JM, Saul M, Higgins PD. Validation of a tool predicting important findings on computed tomography among Crohn's disease patients. United European gastroenterology journal. 2017 Mar 1; 5(2):270-275.

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BACKGROUND: Patients with Crohn's disease (CD) are frequently subjected to computed tomography (CT) in the emergency department (ED). This young population is at higher risk of malignancy from radiation exposure. OBJECTIVES: We aimed to validate a decision tool predicting complications (perforation, abscess or other serious finding) on imaging at two sites. METHODS: We conducted a retrospective review of CT outcomes among patients with CD with ED visits at two tertiary care centers. Inclusion criteria were a CT of the abdomen/pelvis with contrast and complete lab data (erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP)) within 24 hours of arrival at the University of Michigan (UM) (2012-2013) and the University of Pittsburgh (UPMC) (2009-2012). Sensitivity, negative predictive value (NPV), miss rate and CT avoidance rate were calculated. RESULTS: At UPMC (n? = 210), the tool had a sensitivity of 88.9% and NPV of 98.0%, potentially saving 47.1% from CT with a miss rate of 1.0%. At UM (n? = 248), the tool had a sensitivity of 90.9% and NPV of 96.0%, saving 40.3% from CT with a miss rate of 1.6%. CONCLUSION: A decision tool using CRP and ESR predicting CT outcomes among CD patients performed well in an external validation, allowing providers to forgo CT use with a low miss rate.

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