Esophageal Manometry and Impedance Testing
Esophageal manometry and impedance testing help determine the strength of the muscles in the esophagus. It is useful in evaluating gastroesophageal reflux and swallowing abnormalities.
Esophageal manometry testing determines whether there is a problem with motility (the movements of the digestive system and the transit of the contents within it). After the nose and throat are numbed, a small-diameter tube is passed through the nose into the esophagus. Then the patient is asked to swallow, and pressure measurements are taken.
Esophageal impedance tests also involve a tube that is passed through the nose into the esophagus to measure liquid movement from the stomach into the esophagus for patients with bile reflux, rather than acid reflux. Bile reflux occurs when bile, a digestive fluid produced in the liver, flows upward from the small intestine into the stomach and esophagus. Acid reflux occurs when stomach acids flow upward in the esophagus. Bile reflux often accompanies acid reflux.