Figure 13 - Upper esophageal sphincter pressure response to laryngeal air stimulation.

An example of the UES pressure response to laryngeal air stimulation of 6 mmHg with 2-second duration in a young volunteer. As seen, UES pressure abruptly increased from about 30 mmHg and reached 60 mmHg after an air stimulation delivered to the interarytenoid area. The poststimulation pressure continued until the subject swallowed by demand. (Source: Kawamura et al.⁹⁶ with permission from American Gastroenterological Association)