A diagnostic test of esophageal function in which pressures are measured at various points inside the esophagus by passing water-filled catheters through the mouth to the stomach to determine abnormal esophageal conditions.
A test that measures the strength of the contractions of the muscles of the esophagus and the resistance of the lower esophageal sphincter to reflux. The test is performed invasively, by inserting a tube directly into the esophagus.
A diagnostic examination involving the insertion of a slender tube into the esophagus to quantify the extent of muscular pressure exerted by the esophageal wall.