An esophageal motility study (EMS) or esophageal manometry is a test to assess

motor function Motor control is the regulation of movement in organisms that possess a nervous system. Motor control includes reflexes as well as directed movement. To control movement, the nervous system must integrate multimodal sensory information (both ...

of the upper esophageal sphincter (UES), esophageal body and

lower esophageal sphincter The esophagus (American English) or oesophagus (British English; both ), non-technically known also as the food pipe or gullet, is an organ in vertebrates through which food passes, aided by peristaltic contractions, from the pharynx to the ...

(LES).

Indications

An EMS is typically done to evaluate suspected disorders of

motility Motility is the ability of an organism to move independently, using metabolic energy. Definitions Motility, the ability of an organism to move independently, using metabolic energy, can be contrasted with sessility, the state of organisms th ...

peristalsis Peristalsis ( , ) is a radially symmetrical contraction and relaxation of muscles that propagate in a wave down a tube, in an anterograde direction. Peristalsis is progression of coordinated contraction of involuntary circular muscles, which ...

of the

esophagus The esophagus (American English) or oesophagus (British English; both ), non-technically known also as the food pipe or gullet, is an organ in vertebrates through which food passes, aided by peristaltic contractions, from the pharynx to the ...

. These include

achalasia Esophageal achalasia, often referred to simply as achalasia, is a failure of smooth muscle fibers to relax, which can cause the lower esophageal sphincter to remain closed. Without a modifier, "achalasia" usually refers to achalasia of the esop ...

diffuse esophageal spasm Diffuse esophageal spasm (DES), also known as distal esophageal spasm, is a condition characterized by uncoordinated contractions of the esophagus, which may cause difficulty swallowing (dysphagia) or regurgitation. In some cases, it may cause sym ...

nutcracker esophagus Nutcracker esophagus, Jackhammer esophagus, or hypercontractile peristalsis, is a disorder of the movement of the esophagus characterized by contractions in the smooth muscle of the esophagus in a normal sequence but at an excessive amplitude or ...

and hypertensive lower esophageal sphincter. These disorders typically present with

dysphagia Dysphagia is difficulty in swallowing. Although classified under " symptoms and signs" in ICD-10, in some contexts it is classified as a condition in its own right. It may be a sensation that suggests difficulty in the passage of solids or liqu ...

, or difficulty swallowing, usually to both solids and liquids even initially. Other patients with

spasm A spasm is a sudden involuntary contraction of a muscle, a group of muscles, or a hollow organ such as the bladder. A spasmodic muscle contraction may be caused by many medical conditions, including dystonia. Most commonly, it is a muscle ...

disorders may have the test done to diagnose

chest pain Chest pain is pain or discomfort in the chest, typically the front of the chest. It may be described as sharp, dull, pressure, heaviness or squeezing. Associated symptoms may include pain in the shoulder, arm, upper abdomen, or jaw, along with ...

thought not to be of

cardiac The heart is a muscular organ found in most animals. This organ pumps blood through the blood vessels of the circulatory system. The pumped blood carries oxygen and nutrients to the body, while carrying metabolic waste such as carbon di ...

cause. The test is not useful for anatomical disorders of the esophagus (that is, disorders that distort the anatomy of the esophagus), such as peptic strictures and

esophageal cancer Esophageal cancer is cancer arising from the esophagus—the food pipe that runs between the throat and the stomach. Symptoms often include difficulty in swallowing and weight loss. Other symptoms may include pain when swallowing, a hoarse vo ...

Procedure

A technician places a

catheter In medicine, a catheter (/ˈkæθətər/) is a thin tube made from medical grade materials serving a broad range of functions. Catheters are medical devices that can be inserted in the body to treat diseases or perform a surgical procedure. Cat ...

into the nose and then guides it into the stomach. Once placed in the stomach lining, the catheter is slowly withdrawn, allowing it to detect pressure changes and to record information for later review. The patient will be asked at times to take a deep breath or to take some swallows of water. The degree of discomfort varies among patients. Patients are not sedated because sedatives would alter the functioning of the esophageal muscles. Overall the procedure takes about 45 minutes. After the procedure is complete, patients can usually resume their normal daily activities.

Other diagnostic tests for swallowing

Upper gastrointestinal series An upper gastrointestinal series, also called a barium swallow, barium study, or barium meal, is a series of radiographs used to examine the gastrointestinal tract for abnormalities. A contrast medium, usually a radiocontrast agent such as bariu ...

and their fluoroscopic counterparts use

x-rays X-rays (or rarely, ''X-radiation'') are a form of high-energy electromagnetic radiation. In many languages, it is referred to as Röntgen radiation, after the German scientist Wilhelm Conrad Röntgen, who discovered it in 1895 and named it ' ...

to image the swallowing motions.

Recent advances

Recently, high resolution manometry (HRM) has been developed that significantly reduces the procedure time (10 minutes versus 45 minutes with conventional manometry) and provides enhanced patient comfort. Newer catheters incorporate concurrent impedance with HRM.

References

{{Digestive system procedures Medical tests Diagnostic gastroenterology Digestive system procedures

Indications

Procedure

Other diagnostic tests for swallowing

Recent advances

See also

References