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a. Air swallowing results in an increase in impedance starting in proximal impedance channels Imp 1 and going down to the stomach; b. Supragastric belch – swallowed air (air going down), returns rapidly towards the mouth, from the distal esophagus (Imp 6) to proximal esophagus (Imp 1); c. gastric belch – the air originates from the stomach, the increase in impedance is observed first distally (channel Imp 6), and afterwards, air moves rapidly to the proximal esophagus (Imp 1)
