Figure 6 - Schematic depiction of the various elements of pharyngoesophageal motility analysis.

The major measurements are (1) the degree of UES relaxation as measured by the nadir UES pressure, referenced to hypopharyngeal pressure; (2) the magnitude of the intrabolus pressure, as a measure of the resistance to flow across the UES; and (3) the presence or absence of pharyngeal peristalsis.