Gastric Reflux Test (Multichannel Intraluminal Impedance Test)

The Gastric Reflux Test (Multichannel Intraluminal Impedance Test) is performed to detect and record the amount of stomach contents coming back up into the esophagus when a child cries, arches, coughs, gags, vomits, has chest pain, etc. It also determines if the contents are acidic or not, how long they stay in the esophagus as well as how often this occurs.

A thin light wire with an acid sensor as well as six other sensors on it is inserted through the nose into the lower part of the esophagus. The procedure could be uncomfortable upon insertion but is generally painless.

The child shouldn't have anything to eat or drink two hours before the procedure.

The procedure is explained to the patient in detail prior to inserting the wire. Each action is explained to the child before it's performed. Questions can be answered after the wire is placed.

An impedance probe (thin wire with sensors) could be inserted while the child is awake or under anesthesia if combined with another procedure.

The nurse can insert the wire into the child's nose and down the esophagus until the desired depth is reached. This can take place at the bedside, in the operating room or under fluoroscopy. Once proper depth is reached and after an X-ray, the wire will then be taped to the patient's face and hooked into a recorder box for approximately 18-24 hours. The child may go about their daily routine as allowed by his/her physician.

A small amount of family participation is expected during the test.  A parent or other adult will need to push a button on the recording device when the patient does certain activities, such as eating a meal or lying down. This information will help the healthcare team better analyze the test results.

Once the probe is removed on the second day, the information collected in the recorder box will then be downloaded onto a computer, edited and analyzed.

A physician will look at the report created from the data and discuss findings with the patient and family within approximately one week.

The child should not drink carbonated or acidic drinks such as orange juice, soda, etc.

The child should avoid chewing gum and hard candies which can cause an increase in swallowing.

There are no restrictions on activity related to the test.

Last Updated 11/2014