A 48-year-old man presents to the family practice clinic with an 8-month history of progressive difficulty swallowing both solids and liquids. He regurgitates undigested food, sometimes at night, and has lost 5 kg over this time. He has no heartburn, takes no medications and has no known allergies. There is no family history of gastrointestinal cancer. Examination is unremarkable. Hemoglobin is 138 g/L (135-175). A barium swallow shows a dilated esophagus that tapers smoothly to a bird's-beak narrowing at the gastroesophageal junction.
| Heart rate | 72/min |
| Respiratory rate | 14/min |
| Temperature | 36.8 °C |
| O2 saturation | 98%, room air |
| Blood pressure | 124/78 mm Hg |
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Which one of the following is the most appropriate next investigation?
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