Esophageal Manometry test 

An esophageal manometry test diagnoses muscular disorders of the esophagus for patients. This test is recommended if you are suffering from unexplained chest pain or heartburn, or you are experiencing pain or difficulty when swallowing.

About the Esophageal Manometry Procedure
Do not eat or drink anything after midnight prior to the day of your test. Do not smoke the day of your test. If you are an asthma patient, bring your inhaler. Follow your physician’s instructions regarding discontinuing medications. Drugs such as nitrates, calcium channel blockers, theophylline, metoclopramide or sedatives may affect esophageal motor activity. It is preferable to stop these drugs 24 hours prior to testing. 

The actual test involves inserting a very small catheter through the nose, down the back of the esophagus and into the stomach. The catheter is slowly withdrawn while you swallow sips of water and pressures are recorded in the esophagus. The test lasts 60 to 90 minutes.
 
Some patients may experience throat discomfort and nosebleed.

You may drive yourself home after the procedure.