A 32-year-old male presents with dysphagia and regurgitation. A barium swallow image is shown. Which investigation is considered the gold standard for confirming the diagnosis?
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Achalasia: barium swallow shows bird-beak appearance, but gold standard test is esophageal manometry.
Step 1: Understanding the Question:
The clinical features and (implied) barium swallow showing a dilated esophagus with smooth distal tapering ("Bird's beak appearance") point to a diagnosis of Achalasia Cardia. Step 2: Detailed Explanation:
Achalasia Cardia: This is a primary esophageal motility disorder characterized by the failure of the Lower Esophageal Sphincter (LES) to relax and the absence of peristalsis in the distal esophagus.
Barium Swallow Role: While barium swallow is an excellent screening tool showing the "Bird's beak" or "Rat-tail" appearance, it is a morphological test, not a functional one.
Gold Standard - Manometry: Esophageal manometry is the definitive diagnostic test. It directly measures the pressure and movement within the esophagus. The diagnostic findings are: 1. Failure of LES relaxation upon swallowing. 2. High resting LES pressure (>30 mmHg). 3. Aperistalsis in the esophageal body.
Endoscopy Role: Endoscopy is mandatory in every patient with suspected achalasia to rule out "pseudoachalasia" (secondary achalasia due to a tumor at the gastroesophageal junction).
Management: Treatment includes pneumatic dilation, Heller's myotomy (surgical), or Per-Oral Endoscopic Myotomy (POEM).
Step 3: Final Answer:
High-resolution esophageal manometry is the gold standard for the physiological confirmation of Achalasia Cardia.
