The test requires the placement of a special catheter (a small tube 0.1 inches in diameter) through your nose and into small intestine. An upper endoscopy is performed the day prior to antro-duodenal manometry to position the catheter. After placement, you are transferred to a hospital ward to rest for the night. The next day the catheter (tube) will be connected to a computer that records how the stomach and small intestine muscles squeeze the tube. You may feel pressure in the nose or a tickle at the back of the throat. Some patients find this makes them want to swallow frequently until they get used to having the tube in place. You will be able to talk and swallow with the tube in place.

This test typically starts the morning after catheter placement. During the study we will record squeezing of muscles in your stomach and small intestine first during fasting, and later after eating. The test typically takes 6 hours, but may take longer.

Some reasons why you may need an antro-duodenal manometry study:

• Severe nausea and/or vomiting
• Concerns for gastroparesis
• Retching and/or belching

What happens before and after the test?
Before the test, you are not supposed to eat or drink anything as this can cause problems with the medicines used to help you to stay relaxed during the test and may affect correct measurements during manometry. Please ask your doctor whether you should stop taking any current medications in advance before the test.

After the test, the tube is easily pulled from the nose. Once the procedure concludes and the tube is pulled, you can go home.

After the test, if you have any of these symptoms, call your doctor or go to the Emergency Department:

• Tummy pain for more than an hour. Most patients feel fine after the test.
• Throwing up several times. To make sure this isn’t a problem, try to drink small amounts of drinks like Sprite or ginger ale, or eat a little bit of popsicle.
• Bleeding. Passing small amounts of blood (less than a spoonful) may be normal for 1-2 days, but if it is more than that or it continues let your doctor know.
• Fever