A technician places a catheter into the nose and then guides it into the stomach. Once placed in the stomach lining, the catheter is slowly withdrawn, allowing it to detect pressure changes and to record information for later review. The patient will be asked at times to take a deep breath or to take some swallows of water. The degree of discomfort varies among patients. Patients are not sedated because sedatives would alter the functioning of the<unk>  muscles. Overall the procedure takes about 45 minutes. After the procedure is complete, patients can usually resume their normal daily activities.
Esophageal motility study
Esophageal pH monitoring
Nasoendoscopy
Gonioscopy
Sialoendoscopy
Photoglottography
Transnasal esophagoscopy
Impedance–pH monitoring