us-abim MCQ (SBA): Refractory GERD-Diagnosis

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HardGastroenterologyRefractory GERD-Diagnosisus-abimus-usmle-step-3

A 61-year-old with long-standing GERD has persistent regurgitation despite PPI and normal endoscopy. Which next diagnostic test is recommended?

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us-abim MCQ: Refractory GERD-Diagnosis — Answer & Explanation | iatroX