• During the procedure, a local anesthetic (pain-relieving medication) will be applied. 
• This produces numbness in your nose to make it comfortable for the passage of a flexible tube through your nose, down your esophagus, and into your stomach. 
• You may have to swallow a small amount of water to help assesses how well the sphincter and muscles are working. 
• Ambulatory pH study may be done following esophageal manometry study to assess the severity of acid reflux disease. During the procedure, a slender flexible tube with a sensor device attached to the tip will be introduced into your nose, passed through the food pipe and positioned there. 
• It is fastened using the tape to the side of your face. This is attached to a portable recorder that has many buttons to mark events that shall be reviewed by your nurse. 
• During the monitoring, follow your routine activities and do not make any changes in them to ensure the correct assessment.