Mrs. McCallum is a 48-year-old female who presents for evaluation of a vague

set of gastrointestinal symptoms. She feels generally well and has always been healthy, but lately she has had a lot of heartburn and a sense of reflux in her throat. Most recently she has had a recurring sense of food getting stuck in her throat. The AGACNP knows that which diagnostic study should be performed first?

A.Barium swallow     B. Upper endoscopy     C. Esophageal manometry                                  D.Ambulatory pH monitoring

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