The preparation for a Halo procedure, which is done in an outpatient setting, is similar to preparing for EGD. Before the procedure, you may be asked not to eat or to drink only clear liquids. You also might need to avoid certain medications, or you may need to clean out your colon like you would do for a colonoscopy
You’ll be sedated with medication given through a needle in your arm (intravenously, or IV). Any discomfort should be minor. Your doctor may numb your throat with a spray before placing the tube (endoscope) in your mouth. Using the heat from the electrodes on the endoscope, your doctor removes the thin layer of diseased tissue from your esophagus. A camera on the endoscope transmits pictures to computer screens. If you have a large area of diseased tissue, it may be treated with a balloon filled with electrodes that enters your esophagus through the endoscope.