Figure 2 - Normal upper esophageal sphincter (UES) relaxation recorded by a sleeve–side-hole assembly.
From the following article
Richard H. Holloway
GI Motility online (2006)
doi:10.1038/gimo30
UES relaxation has been recorded by a sleeve; the remaining channels are from side-hole sensors. UES pressure has fallen to the level of hypopharyngeal pressure as indicated by the dashed line.
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