Journal of Neurogastroenterology and Motility : eISSN 2093-0887 / pISSN 2093-0879

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Fig. 2. Intrabolus pressure (arrow; A) may be misunderstood as a common cavity (arrow; B). The first occurs only during swallows, occur until the peristalsis and always exceeds 30 mmHg while a common cavity may occur in the absence of swallow during a transient relaxation of the lower esophageal sphincter, may slowly ascends creating a bell-shaped pressurization or do not persist until the peristalsis and it is isobaric to the gastric pressure (that rarely exceeds 30 mmHg). Artifact due to air entrapment in the protective shield is a high pressure at the end of peristalsis, not before as in the previous situations (arrow; C).
J Neurogastroenterol Motil 2021;27:513~517
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