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A and B: relationship between changes in ultrasound (US) images, pressure, impedance, and cross-sectional area (CSA) of the circular muscle (CM) and longitudinal muscle (LM) of the esophagus at 5 cm above the lower esophageal sphincter (LES) in a normal subject. Note, the onset of luminal distension is associated with drop in impedance and luminal closure is associated with increase in thickness and CSA of circular and longitudinal muscle thickness.
