A Prospective Evaluation of Computerized Tomographic(CT) Scanning as a Screening Modality for Esophageal Varices
Patients with cirrhosis require endoscopic screening for large esophageal varices. The aims of this study were to determine the cost -effectiveness and patient preferences of a strategy employing abdominal computerized tomography (CT) as the initial screening test for identifying large esophageal varices. In a prospective evaluation,102 patients underwent both CT and endoscopic screening for gastroesophageal varices. Two radiologists read each CT independently; standard upper gastrointestinal endoscopy was the reference standard. Agreement between radiologists, and between endoscopists regarding size of varices was determined using kappa statistic. Cost-effectiveness analysis was performed to determine the optimal screening strategy for varices. Patient preference was assessed by questionnaire. CT was found to have an approximately 90% sensitivity in the identification of esophageal varices determined to be large on endoscopy, but only about 50% specificity. The sensitivity of CT in detecting gastric varices was 87%. In addition, a significant additional number of gastric varices, peri-esophageal varices, and extraluminal pathology were identified by CT but not identified by endoscopy. Patients overwhelmingly preferred CT over endoscopy . Agreement between radiologists was good regarding the size of varices (Kappa = 0.56), and exceeded agreement between endoscopists (Kappa = 0.36). Use of CT as the initial screening modality for the detection of varices was significantly more cost-effective compared to endoscopy irrespective of the prevalence of large varices. In conclusion, abdominal CT as the initial screening test for varices could be cost-effective. CT also permits evaluation of extra-luminal pathology that impacts management.
|Study Design:||Observational Model: Case-Only
Time Perspective: Prospective
|Official Title:||The Accuracy of Contrast Abdominal CT for the Detection of High-Grade Esophageal and Gastric Varices in Patients With Cirrhosis|
|Study Start Date:||January 2003|
|Study Completion Date:||December 2007|
|Primary Completion Date:||October 2005 (Final data collection date for primary outcome measure)|