Figure 7 - Direction of intraluminal bolus movement as detected by multichannel intraluminal impedance.
From the following article
Gastroesophageal reflux monitoring: pH and impedance
Radu Tutuian and Donald O. Castell
GI Motility online (2006)
doi:10.1038/gimo31
a: Drops in impedance starting proximally and moving distally are indicative of antegrade bolus movement as seen during swallowing. b: Drops n impedance starting distally and moving proximally are indicative of retrograde bolus movement as seen during reflux.
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