Esophageal manometry has long been the gold standard for assessment of esophageal motility. Recently, high-frequency intraluminal ultrasonography (HFIUS) has been introduced to measure esophageal contractility and the thickness of esophageal muscle. Greater esophageal muscle thickness has been reported in patients with achalasia, diffuse spasm, and hypertensive peristalsis. In this issue of the Journal, Mittal and colleagues report additional observations in patients with esophageal symptoms referred for esophageal manometry. Their findings confirm earlier observations in patients with spastic motor disorders and report new findings of greater muscle thickness in patients with nonspecific motor disorders as well as normal manometry. Greater muscle thickness was associated with a greater prevalence of dysphagia suggesting the possibility that symptoms may be related, at least in part, to alterations in the biomechanics of the esophagus. The place of HFIUS in the assessment of esophageal function remains to be determined, but it offers the possibility of greater insights into esophageal physiology as well as clinical esophageal motor disorders.
(Am J Gastroenterol 2007;102:146-148)Intraluminal manometry has been the gold standard for assessment of esophageal motor function for over 50 yr. Arguably, it has probably contributed more to our understanding of esophageal motility and esophageal motor disorders than any other single measurement modality. Currently, definitions of esophageal motor disorders are based primarily on the manometric features and the patterns of abnormal peristaltic and lower esophageal sphincter (LES) function. Other modalities, such as barium radiology and radionuclide scintigraphy, have forged useful but complementary roles. However, their usefulness and diagnostic specificity are limited by their radiation exposure, qualitative nature, and lack of specific features for all individual motor disorders.Maintenance of the primary position of manometry in the assessment of esophageal motility has been helped by a number of improvements in manometric methodology. These include the development of high-fidelity recording systems, multiple recording sites that allow for recording from the entire esophagus simultaneously, and the sleeve sensor for continuous recording of sphincter pressure. Most recently, the development of high-resolution manometry and topographical displays has yielded new perspectives on and insights into esophageal motor function (1, 2). Perhaps, the most important of these as the recognition that esophageal peristalsis is not a single propagated wave but a composite of two if not three separate sequences that are organizationally separate but temporally and functionally coordinated to yield a propagated pressure wave that traverses the whole esophagus. Whether such detailed mapping of esophageal motility improves the diagnostic utility of manometry over that already available from conventional 8-channel sleeve manometry remains to be demonstrated (3, 4), although it clearly offe...