Figure 1 - Ambulatory pH catheter placement.
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: Dual-channel proximal and distal esophageal pH monitoring is used to monitor patients with reflux symptoms off therapy. b: Dual channel distal esophageal and gastric pH monitoring is used to monitor patients with reflux symptoms on acid suppressive therapy.
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