Figure 4 - Ambulatory pH monitoring tracings.
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: Normal proximal and distal esophageal acid exposure. b: Abnormal distal esophageal acid exposure during upright position. c: Abnormal distal esophageal acid exposure during upright and recumbent position.
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