Figure 5 - Examples of esophageal peristalsis and LES relaxation during three swallows each of 5 mL of water.
From the following article
How to perform esophageal manometry
R. Shaker and C. Hofmann
GI Motility online (2006)
doi:10.1038/gimo90
As seen, each water swallow (SW) results in the development of a peristaltic pressure wave that propagated distally (dark line). This is accompanied by relaxation of the LES.
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