Correlation between Serum-Ascites Albumin Gradient and Esophageal Varices in Portal Hypertension due to Cirrhosis of Liver

Abstract

Introduction: Cirrhosis of the liver is a major health problem in our country.  Patients with cirrhosis are at risk of developing esophageal varices and variceal bleeding with high mortality. They must undergo routine upper gastrointestinal endoscopy to screen for the presence of varices. This poses an economic, social, and medical burden. Thus, this warrants a non-invasive predictor of esophageal varices in a cirrhotic patient. The aim of this study was to find the correlation between SAAG and esophageal varices in portal hypertension due to cirrhosis of liver.

Methods: Patients (45 males and 35 females) above 18 years of age and with cirrhosis of the liver underwent cross sectional observational study at Nepal Medical College Teaching hospital between October 2015 and December 2017 AD. Serum albumin and ascitic fluid albumin were analyzed on the same day and serum-ascites albumin gradient (SAAG) was calculated. Upper GI endoscopy was done to evaluate for the presence of esophageal and gastric varices. Pearson's chi-square test was applied to see the relation between SAAG and esophageal varices. 

Results: Among the 80 patients studied, 56.2% were male and  93.75%  had varices. Majority of the patients who had esophageal varices had SAAG of more than 1.1 g/dL. A positive correlation was found between serum-ascites-albumin gradient and esophageal varices but was statistically not significant. A cut-off of  >1.6 for SAAG to discriminate between presence and absence of varices yielded a sensitivity of 78.66% and a positive predictive value of 92.18%.

Conclusion: This study highlighted that SAAG has a positive correlation with esophageal varices with high sensitivity and positive predictive value in estimating the presence of varices but without statistical significance. It has a low specificity. Due to statistically insignificant correlation and low specificity, SAAG cannot be used in place of upper GI endoscopy in diagnosing gastroesophageal varices