Efficacy of Esophageal Impedance/pH Monitoring in Patients With Refractory Gastroesophageal Reflux Disease, on and off Therapy  Jason M. Pritchett, Muhammad Aslam, James C. Slaughter, Reid M. Ness, C. Gaelyn Garrett, Michael F. Vaezi  Clinical Gastroenterology and Hepatology  Volume 7, Issue 7, Pages 743-748 (July 2009) DOI: 10.1016/j.cgh.2009.02.022 Copyright © 2009 AGA Institute Terms and Conditions

Figure 1 Flow diagram of study design and likelihood of normal or abnormal impedance and wireless pH parameters. Clinical Gastroenterology and Hepatology 2009 7, 743-748DOI: (10.1016/j.cgh.2009.02.022) Copyright © 2009 AGA Institute Terms and Conditions

Figure 2 Box plot of % time pH <4 for day 1 and day 2 on the basis of impedance results (range, upper and lower quartile, and median values displayed). Clinical Gastroenterology and Hepatology 2009 7, 743-748DOI: (10.1016/j.cgh.2009.02.022) Copyright © 2009 AGA Institute Terms and Conditions

Figure 3 Flow diagram of likelihood of off-therapy pH findings as a function of on-therapy impedance data. Clinical Gastroenterology and Hepatology 2009 7, 743-748DOI: (10.1016/j.cgh.2009.02.022) Copyright © 2009 AGA Institute Terms and Conditions

Figure 4 Probability of being classified abnormal by wireless pH on the basis of total number of impedance events. Clinical Gastroenterology and Hepatology 2009 7, 743-748DOI: (10.1016/j.cgh.2009.02.022) Copyright © 2009 AGA Institute Terms and Conditions