What is a Gastric Reflux Test (Multichannel Intraluminal Impedance Test)?
The gastric reflux test (Multichannel Intraluminal Impedance Test) is used to find and count how often stomach contents come back into the esophagus. It also shows how these reflux events are connected to symptoms (like when a child cries, arches, coughs, gags, vomits or has chest pain). The test also shows if the contents are acidic and how long they stay in the esophagus.
The test is done using a thin, light wire with sensors. It is put through the nose into the lower part of the esophagus. The wire is then connected to a recorder box that your child will carry with them during the study, which lasts about 23 hours.
Before the Test
Your child should not eat or drink anything for two hours before the procedure if the wire is placed while your child is awake. If your child will be under anesthesia, you will get specific instructions on how to prepare.
The procedure will be explained in detail before the wire is placed. Each step is explained to your child before it's done. Child Life staff may help support your child and care team during placement, as this can be an uncomfortable procedure while awake.
During the Test
The nurse will put the wire into your child's nose and down the esophagus. The wire will be taped to your child’s face so it stays in place. An X-ray will be done to make sure the wire is in the right place. The wire may need to be moved slightly. Once the wire is in the right place, the recording will start and last about 23 hours. Your child will stay in the hospital so they can be watched, but they may do their usual activities if their doctor allows.
You and / or another caregiver will need to help during the test by pushing a button on the recording device when your child eats a meal, lays down, or is actively having symptoms. This information will help the healthcare team better analyze the test results.
After the Test
After the wire is taken out on the second day, the information collected in the recorder box will be downloaded to a computer, edited and analyzed. It will take about two weeks before the final report and results are ready.
A doctor will look at the report and talk with you and your child about the results.
