Timed Barium Swallow: Diagnostic Role and Predictive Value in Untreated Achalasia, Esophagogastric Junction Outflow Obstruction, and Non-Achalasia Dysphagia.

Abstract

Timed barium swallow (TBS) assesses esophageal emptying in patients with achalasia and is considered the standard workup for patients with dysphagia. Our aim was to determine the usefulness of TBS in differentiating patients with achalasia (type 1-3), esophagogastric junction outflow obstruction (EGJOO), and non-achalasia dysphagia. We performed a retrospective cohort study including consecutive patients who underwent TBS evaluation between May 2013 and September 2015. Patients were separated into untreated achalasia (n=117), EGJOO (n=46), and non-achalasia (n=146) groups. Diagnosis of achalasia/EGJOO was based on high-resolution manometry using Chicago Classification. Receiver operating characteristic (ROC) curve analysis was performed to determine the accuracy of TBS (barium height at 1 and 5 min and tablet retention) in identifying achalasia vs. EGJOO and non-achalasia. Barium column height of 5 cm at 1 min showed a sensitivity of 94% and specificity of 71% and barium column height of 2 cm at 5 min showed a sensitivity of 85% and specificity of 86% in differentiating untreated achalasia from EGJOO and non-achalasia. Combined liquid barium and tablet increases diagnostic yield from 79.5 to 100% in untreated achalasia patients and from 48.9 to 60% in EGJOO patients. TBS is a simple and useful test in differentiating untreated achalasia, EGJOO, and non-achalasia dysphagia. We propose that barium height >2 cm at 5 min be used as cutoff point for identifying achalasia. Combination of liquid barium and tablet increased the diagnostic yield of TBS in achalasia and EGJOO. Retention of barium tablet alone suggests functional/anatomic obstruction at the esophagogastric junction.