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| Petrov, R. H. | Madrid |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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Goto, Chihiro
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document
Differences between Patients with Heartburn Refractory to Vonoprazan and Those Refractory to Proton Pump Inhibitors
Abstract
<jats:title>Abstract</jats:title><jats:p><jats:bold>Background</jats:bold> Vonoprazan, a potassium-competitive acid blocker, demonstrates more potent acid inhibition than proton pump inhibitors (PPIs). This study aimed to evaluate the effect of vonoprazan in patients with unproven gastroesophageal reflux disease (GERD) by comparing patients with vonoprazan-refractory heartburn with those with PPI-refractory heartburn.<jats:bold>Methods</jats:bold> This study included 104 consecutive patients with vonoprazan- or PPI-refractory heartburn (52 patients each), no erosive esophagitis on endoscopy and who underwent combined multichannel intraluminal impedance–pH (MII-pH) testing with vonoprazan/PPI discontinuation. Patients’ backgrounds, symptom scores from four questionnaires, MII-pH results and high-resolution manometry results were compared between the two groups.<jats:bold>Results</jats:bold> The vonoprazan group demonstrated significantly higher GERD symptoms and scores of abdominal pain and diarrhea on the Gastrointestinal Symptom Rating Scale questionnaire. MII-pH results revealed that the vonoprazan group demonstrated 40.4%, 17.3% and 42.3% and the PPIs group exhibited 26.9%, 17.3% and 55.8% of abnormal acid reflux (true non-erosive reflux disease [NERD]), reflux hypersensitivity and functional heartburn, respectively. The vonoprazan group demonstrated higher true NERD rates but with no significant difference. Among the vonoprazan group, eight patients with true NERD underwent another MII-pH test on vonoprazan, and all cases demonstrated normal acid exposure times (0.0% [0.0–0.3]).<jats:bold>Conclusions</jats:bold> Patients with unproven GERD with vonoprazan-refractory heartburn demonstrated more symptoms, including not only GERD symptoms but also functional dyspepsia and irritable bowel syndrome symptoms, than those with PPI-refractory heartburn.</jats:p>