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Figure 3: Impedance parameters in the multichannel intraluminal impedance and esophageal manometry. Bolus clearance is complete if bolus is detected at the most proximal sensor and it “exits” all sensors in sequence, as shown in the figure. Bolus transit time is the period of time between the first and the last detection of the bolus, in the most proximal and in the most distal sensor, respectively. +—begin of bolus detection and *—end of bolus detection.