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Ambulatory pH monitoring is considered to be the gold standard for detection of gastroesophageal reflux disease. However, recent findings have revealed significant differences in reported esophageal acid exposure between simultaneous esophageal pH recordings using the Bravo wireless system and standard transnasally positioned antimony catheter systems (Gut 2005; 54:1682). Researchers prospectively compared the accuracy of the Bravo wireless system and the Slimline catheter with that of the Mark III Digitrapper pH system (provided by Medtronic Inc.) in the detection of acid reflux events in 25 healthy volunteers without esophagitis.
The Bravo capsule was placed 6 cm above the squamocolumnar junction, and the Slimline catheter was placed 5 cm …