What Is Esophageal Manometry?
Esophageal manometry is a diagnostic test that evaluates the coordinated muscle movement — known as motility — of the esophagus. The esophagus is the muscular tube connecting your mouth to your stomach, approximately 25 cm long in adults. When you swallow, a precisely timed wave of muscle contractions pushes food downward. Two specialized valves — called the upper esophageal sphincter (UES) and the lower esophageal sphincter (LES) — control how food enters and exits the esophagus.
During the test, a thin, flexible tube called a catheter is passed through the nose and into the esophagus. Sensors along the catheter continuously measure the pressure generated by the esophageal muscles and sphincters as you swallow. This data is recorded by a computer and reviewed by a gastroenterologist or motility specialist.
When the muscles do not work properly — contracting too weakly, too forcefully, or in an uncoordinated pattern — the result can be symptoms such as trouble swallowing, chest pain, heartburn, and regurgitation. Esophageal manometry pinpoints the underlying cause by producing a detailed pressure map of the entire esophagus.
Why Is Esophageal Manometry Performed?
Your doctor may recommend this test if you are experiencing symptoms that suggest abnormal esophageal muscle function, or to plan and evaluate esophageal surgery. The test is used to diagnose or rule out the following conditions:
Achalasia
A motility disorder in which the lower esophageal sphincter fails to relax during swallowing, and the esophageal muscles lose the coordinated contractions needed to push food into the stomach. Manometry is the definitive diagnostic test for achalasia.
Diffuse Esophageal Spasm
A condition where the esophageal muscles contract in a random, uncoordinated manner, disrupting normal swallowing and often causing chest pain that can mimic a heart attack.
Scleroderma (Esophageal Involvement)
This rare autoimmune connective tissue disease can cause the lower esophagus muscles to become stiff and stop moving, leading to severe reflux and swallowing problems.
Jackhammer Esophagus / Hypercontractile Esophagus
Abnormally strong esophageal contractions that can cause pain, pressure, and difficulty swallowing solid food.
Pre- and Post-Surgical Evaluation
Manometry is routinely performed before esophageal surgery (such as fundoplication for GERD) to confirm baseline muscle function, and afterward to assess how well the repair is working.
Manometry can also be combined with a 24-hour pH impedance test to diagnose gastroesophageal reflux disease (GERD). In this context, manometry determines the precise location in the esophagus where the pH probe should be placed for maximum accuracy.
Types of Esophageal Manometry
Conventional Manometry
Uses a catheter with a small number of widely spaced pressure sensors. Still used but becoming less common as high-resolution technology has improved.
High-Resolution Manometry (HRM)
Uses a catheter with 36 or more closely spaced sensors. Collects richer, faster data and produces detailed "pressure topography plots" — the current gold standard.
Manometry with Impedance
Combines pressure measurement with electrical impedance sensing. Used when a GERD workup is planned to locate the optimal position for a pH probe within the esophagus.
High-resolution manometry has largely replaced conventional manometry in specialized centers because it captures more data points simultaneously, reducing the need to reposition the catheter and improving diagnostic accuracy for subtle motility disorders.
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