Figures, tables and video
From the following article
How to locate the lower esophageal sphincter and upper esophageal sphincter for pH recording
R. Shaker and C. Hofmann
GI Motility online (2006)
doi:10.1038/gimo91
Video 1
Demonstration of the manometric techniques for localizing the upper and lower esophageal sphincters.
Full size video and legend (0K)