Esophageal Manometry Test - An Overview

Introduction

The food pipe, also known as the esophagus, acts like a hollow tube running to the stomach through the upper part of the throat. It can mechanically push solids and liquids from the mouth to the stomach using sphincters and sequentially timed waves of contraction in its smooth muscle. Dysphagia (swallowing difficulty), which is caused by motor activity in the esophagus, can, for example, be due to disturbed action of the esophagus itself; this is similar to what happens in gastroesophageal reflux disease (leakage of stomach content into the food pipe). In case a doctor finds out that there is a malfunction in the esophagus, they will then carry out some vital tests aimed at assessing its structure, including endoscopic examinations such as esophagogastroduodenoscopy done to look for abnormalities or issues in the upper gastrointestinal tract, pH (potential of hydrogen) monitoring, and an upper GI (gastrointestinal) swallow study (basically an X-ray performed after you swallow barium).

How Does Esophageal Manometry Test Work?

Esophageal manometry can help detect issues with the upper and lower esophagus valves, among others, within muscular function. This test has a soft catheter that passes through the nostrils to reach the stomach. This catheter measures the pressure inside both the upper and lower esophageal sphincter, along with recording the pressure the esophagus muscles apply. These sphincters act like controllers of the amount of food that can enter or out of our throats.

What Is a High-Resolution Manometry (HRM) Test?

High-resolution manometry has practically taken over the traditional procedure of esophageal manometry in which contractions and pressure can be measured by probes placed every five centimeters or 1.9 inches along the length of the esophagus. The catheter placed with high-resolution manometry has more sensors and is one centimeter or 0.39 inches apart inside the esophagus. Due to this new technology, HRM can gather more comprehensive data faster than with more conventional approaches. An in-depth assessment of the activity in the esophagus is provided, and the procedure is initiated from catheter introduction to when ten wet swallows are performed.

How Is the Procedure Performed for Esophageal Manometry?

Before the procedure, patients should not consume the following medications at least 24 hours before the test: nitrates, opioids, calcium channel blockers, and sedatives, as per the physician's advice. Patients are given instructions to fast for six hours before the procedure. The catheter, which contains 36 sensor probes, is inserted into the esophagus when the throat and nose are completely anesthetized to start the test. The HRM catheter is present at the sites of the LES (lower esophageal sphincter), the UES (upper esophageal sphincter), and the entire esophageal body.

Subsequently, the baseline swallow is followed by conducting ten swallows with 0.16 fluid ounces of water, timed not less than 30 seconds from one another. During the swallows, the sensors will measure and create color pressure topography maps (Clouse plots) of several parameters: integrated relaxation pressure, distal contractile integral, contractile deceleration point, and distal latency. More diagnostic data can be achieved using adjunctive tests in the presence of HRM. Adjunctive tests in a sitting patient may include larger amounts of water, rapid swallows, or solid test swallows. These adjunctive tests can stimulate physiological swallows and sometimes increase the diagnostic yield of esophageal motility disorders.

What Are the Indications of Esophageal Manometry?

The functioning of the esophageal muscles can be determined using this procedure. Some conditions that are developed when these muscles do not function as they are supposed to include chest pain, regurgitation or the return of food after swallowing, or heartburn. This process can then ascertain the root cause of the conditions or problems induced by these symptoms. The conditions include :

• Achalasia: This is the failure of the esophageal muscles to depress food and shut the stomach open fully.

• Diffuse Esophageal Spasm: This pathological state allows excessive esophageal muscular involvement, which can result in aberrant swallowing behaviors.

• Scleroderma: It is a very rare condition that may cause the failure of some of the esophageal muscles.

What Can Be the Result of Esophageal Manometry?

The provider will examine the data from the esophageal pressure topography map, which manifests the presence of several crucial elements.

• Peristaltic vigor is the strength or weakness of the automatic muscle contractions, propelling food down the esophagus.

• Peristaltic integrity is the consistency of the contractions throughout the esophagus or the absence of gaps or breaks.

• The speed with which these contractions decrease when they reach the lower esophagus and prepare for their last contraction is defined as distal latency at the contractile deceleration point.

• LES (lower esophageal sphincter) relaxation during a swallow is the extent to which the lower esophageal relaxes to allow food into the stomach.

Such results may indicate certain esophageal motility disorders. These include hypertensive or hypercontractile peristalsis, where the esophagus muscle may spasm or show excessive contraction. On the other hand, poorly formed or absent peristalsis could occur when the muscle contraction is weak, disorganized, or completely absent. Another abnormality could be diminished distal latency and premature deglutition, in which contraction passes through the lower esophageal sphincter without the general slowing-up.

What Problems Does Esophageal Manometry Cause?

Esophageal manometry challenges are relatively rare; nevertheless, they can occur intermittently. The complication might be arrhythmia (an irregular heartbeat), aspiration of stomach contents, and esophageal perforation if the tube perforates the esophageal wall. The tube can sometimes slip into the larynx during its positioning; thus, the patient will have the impression that he is choking. Some after-effects that the patient will feel after the procedure are a slight sore throat, which can be overcome by using OTC (over-the-counter), throat lozenges, temporary nasal congestion, or slight nosebleeds.

What Is the Difference Between Barium Swallow and Esophageal Manometry?

Barium swallow tests and esophageal manometry may be performed to evaluate trouble swallowing with associated symptoms. The patient drinks a barium solution made of contrast materials and looks black on an X-ray. This procedure can assist in spotting abnormalities in the anatomy that esophageal manometry fails to recognize, including unusually wide or thin sections of the esophagus. On the contrary, esophageal manometry examines the pressure and rigidity of the esophageal muscles when swallowing. It identifies variations in muscle activity throughout the entire esophagus, notably spasms that are excessively strong or insufficient in strength. Unlike manometry, muscle contraction force cannot be quantified in a barium swallow examination. The healthcare provider might suggest one or both of them.

Conclusion

Esophageal manometry assesses esophageal functioning—particularly muscle contractions when swallowing and the pressure of LES. It helps diagnose some important causes for esophageal motility disorders such as achalasia, diffuse esophageal spasm, or scleroderma. The test results contribute to giving an appropriate treatment plan accordingly, depending on whether abnormal muscle coordination or improper LES function is responsible for presenting symptoms of difficulty in swallowing, chest pain, or reflux. Ultimately, the test will help physicians evolve their therapeutic approaches to better handle the patient's condition.