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A Clinical Prediction Rule and Platelet Count Predict Esophageal Varices in Children



A Clinical Prediction Rule and Platelet Count Predict Esophageal Varices in Children

Juan Cristóbal Gana, Dan Turner, Giorgina Mieli–Vergani, Mark Davenport, Tamir Miloh, Yaron Avitzur, Jason Yap, Veronique Morinville, Herbert Brill, Simon C. Ling

Gastroenterology,
141:6, September 16, 2011

A Clinical Prediction Rule and Platelet Count Predict Esophageal Varices in Children

Background & Aims
The validation of noninvasive tests to diagnose esophageal varices is a priority in children because repeated endoscopic evaluations are too invasive. We measured the ability of a previously developed noninvasive clinical prediction rule (CPR) to predict the presence of esophageal varices in children.


Methods
We analyzed data from 108 children, younger than age 18, who received endoscopies at 8 centers, to assess portal hypertension from chronic liver disease or portal vein obstruction. Blood test and abdominal ultrasound scan results were obtained within 4 months of endoscopy. Grading of varices identified by endoscopy was confirmed by independent blinded review. Spleen size, based on data from the ultrasound scan, was expressed as a standard deviation score relative to normal values for age.


Results
Of the children studied, 74 had esophageal varices (69%), including 35 with large varices (32%). The best noninvasive predictors of esophageal varices of any size were as follows: platelet:spleen size z-score ratio (area under the receiver operating characteristic curve [AUROC], 0.84; 95% confidence interval [CI] 0.75–0.93), CPR (AUROC, 0.80; 95% CI, 0.70–0.91), and platelet count (AUROC, 0.79; 95% CI, 0.69–0.90). The positive predictive values for the CPR and platelet count were 0.87 and 0.86, the negative predictive values were 0.64 and 0.63, the positive likelihood ratios were 3.06 and 2.76, and the negative likelihood ratios were 0.64 and 0.63, respectively. Based on positive and negative predictive values, the most accurate noninvasive tests were the CPR and platelet counts.


Conclusions
Noninvasive tests such as CPR and platelet count can assist in triaging children for endoscopy to identify esophageal varices.







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Prepared by: Dr. Houssam Al-Nahhas






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