Age-related impairment of esophagogastric junction relaxation and bolus flow time

Figure 2 Method for determining bolus flow time at the esophagogastric junction using pressure impedance data (modified from Lin 2014). A: Esophageal pressure topography of region of interest at EGJ; B: Bolus flow is determined as occurring at the EGJ when the distal esophageal impedance drops below 90% of baseline until impedance returns above 50% baseline (purple area), provided pressure criteria are simultaneously met at the crural diaphragm (CD) position; C: Pressure above 10 mmHg and 50% peak pressure inhibits bolus flow at CD position despite impedance criteria being met (* - corresponding with yellow area in B).