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Effect of changing pH of cervical esophageal perfusate on spontaneous occurrence of pharyngeal swallows and secondary peristalses (SP). These are GH, TH, CP, and CT EMG recordings and the E7 manometric recording in response to a change in pH of the fluid perfused through the cervical esophagus. Note that selective change in pH of the thoracic esophagus from 7.2 to 1.2 greatly increased the spontaneous rate of pharyngeal swallows.
