A 50-year-old gynecologist complains of dysphagia, regurgitation, and weight loss. She also states that she feels as if food is stuck at the level of the xiphoid. An upright chest x-ray shows a dilated esophagus with an air-fluid level. Which of the following is FALSE?
A
A barium swallow will show a "bird's beak" deformity
B
Manometry will demonstrate that the LES fails to relax during swallowing.
C
Upper endoscopy should be avoided because of the risk of complications.
D
Medical treatment includes nitrates and calcium channel blockers.