You will be given medication through a vein to make you relaxed and sleepy, and your throat may be sprayed with local anesthetic. While you are lying in a comfortable position on an X ray table, the ERCP endoscope will be inserted through the mouth and into the duodenum. During the procedure, while X-rays are being taken, you may be asked to change your position.
The tube will not interfere with your breathing. Gagging is usually prevented by the medication.
During the procedure, you may feel bloated due to the air used to inflate the intestine. An X ray contrast material is injected into the ducts, you may feel some discomfort.