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Traditional, 24-hour, catheter-based pH monitoring fails to establish a diagnosis of gastroesophageal reflux disease in 13% to 23% of patients (Gastroenterology 1987; 93:85). This variable sensitivity is mainly due to catheter movement caused by patients swallowing, breathing, and changing body positions. To limit this effect, and to limit transient migration of the pH monitor electrode into the proximal stomach, physicians are advised to position electrodes 6 cm above the upper border of the lower esophageal sphincter (LES). Although a wireless pH monitoring system (JW Gastroenterol May 31 2005) can now be attached to the esophageal mucosa and can maintain a constant position, the traditional placement of 6 cm above the LES has remained un…