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. Author manuscript; available in PMC: 2014 Jul 10.
Published in final edited form as: J Gastrointest Surg. 2011 Oct 28;16(1):16–25. doi: 10.1007/s11605-011-1741-1

Fig. 2.

Fig. 2

Impedance tracing of acid LPR. Acid LPR is defined when retrograde bolus transit occurs across all ring sets and ultimately reaches the hypopharynx in addition to both esophageal and pharyngeal pH sensors dropping <4