S. MOHSIN SHAH, M.D.
To the editor: I found Dr. Castell's review of the lower esophageal sphincter (Ann Intern Med 83:390-401, 1975) very informative. However, the normal and abnormal pressures listed in Table 1 of his paper can be a source of confusion to the clinician. He should be aware of the variables that affect recording fidelity of pressures (1). In addition, the method used to determine the lower esophageal sphincter pressure will influence the values obtained. In normal subjects the lower esophageal sphincter pressure measured by a rapid pull-through method (24.3 ± 9.5 mm Hg) was significantly greater than the pressure measured by
SHAH SM. Esophageal Pressures. Ann Intern Med. ;84:343. doi: 10.7326/0003-4819-84-3-343
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Published: Ann Intern Med. 1976;84(3):343.
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