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Proton-pump inhibitors (PPIs) are the dominant strategy for treating moderate-to-severe gastroesophageal reflux disease. Although these agents are extremely effective, they fail in a subset of patients with suspected GERD. Defining the optimal diagnostic and therapeutic strategies for these patients has been problematic. Particularly vexing is the question of whether to perform 24-hour pH/impedance monitoring while patients are on or off PPI therapy.
To explore this issue, investigators conducted a prospective, randomized, crossover trial among 30 patients who had symptoms of heartburn, chest pain, or regurgitation despite twice-daily PPI therapy. Each patient underwent monitoring both on and off therapy. Reflux episodes were identified as a…