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Impedance characteristics of retrograde propagation bolus (dotted arrow) during (A) acid and (B) nonacid gastroesophageal reflux (GER). Anterograde clearance (hashed arrow), acid clearance time (ACT), and bolus clearance time at channel 3 (BCT-3) and channel 6 (BCT-6) are shown. The location of the pH channel is shown. LES, lower esophageal sphincter; UES, upper esophageal sphincter.
