Figure 8 - Example of esophagopharyngeal regurgitation captured during prolonged manometric and dual pH recording.
From the following article
Clinical disorders of the upper esophageal sphincter
Ian J. Cook
GI Motility online (2006)
doi:10.1038/gimo37
The sleeve sensor that was monitoring LES pressure has slipped into the stomach; hence, no recording of LES pressure is visible. However, during a period of prolonged esophageal acidification, this example clearly shows a spontaneous (non–swallow-related) UES relaxation, which mediates pharyngeal acidification.
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