Endoscopic ultrasonography (EUS) allows your doctor to examine your esophageal and stomach linings as well as the walls of your upper and lower gastrointestinal tract.  The upper tract consists of the esophagus, stomach and duodenum; the lower tract includes your colon and rectum.  EUS is also used to study other organs that are near the gastrointestinal tract, including the lungs, liver, gall bladder and pancreas.

Endoscopists are highly trained specialists who welcome your questions regarding their credentials, training and experience. Your endoscopist will use a thin, flexible tube called an endoscope that has a built-in miniature ultrasound probe.  Your doctor will pass the endoscope through your mouth or anus to the area to be examined. Your doctor then will use the ultrasound to use sound waves to create visual images of the digestive tract.

Why is EUS Done?

EUS provides your doctor with more information than other imaging tests by providing detailed images of your digestive tract.  Your doctor can use EUS to diagnose certain conditions that may cause abdominal pain or abnormal weight loss.

EUS is also used to evaluate known abnormalities, including lumps or lesions, which were detected at a prior endoscopy or were seen on x-ray tests, such as a computed tomography (CT) scan.  EUS provides a detailed image of the lump or lesion, which can help your doctor determine its origin and help treatment decisions.

Preparation

For EUS of the upper gastrointestinal tract, you should have nothing to eat or drink, usually for six hours before the examination.  Your doctor will tell you when to start this fasting and whether it is advisable to take your regular prescription medications.

For EUS of the rectum or colon, your doctor will instruct you to either consume a colonic cleansing solution or to follow a clear liquid diet combined with laxatives or enemas prior to the examination.  The procedure might have to be rescheduled if you don’t follow your doctor’s instructions carefully.

What To Expect During EUS

Practices vary among doctors, but for an EUS examination of the upper gastrointestinal tract, some endoscopists spray your throat with a local anesthetic before the test begins.  Most often you will receive sedatives intravenously to help you relax.  You will most likely begin by lying on your left side.  After you receive sedatives, your endoscopist will pass the ultrasound endoscope through your mouth, esophagus and stomach into the duodenum.  The instrument does not interfere with your ability to breathe.  The actual examination generally takes less than 60 minutes.  Many do no recall the procedure.  Most patients consider it only slightly uncomfortable, and many fall asleep during it.

An EUS examination of the lower gastrointestinal tract can often be performed safely and comfortably without medications, but you’ll receive a sedative if the examination will be prolonged or if the doctor will examine a significant distance into the colon.  You will start by lying on your left side with your back toward the doctor.  Most EUS examinations of the rectum generally take less than 45 minutes.  You should know that if a needle biopsy of a lesion or drainage of a cyst is performed during the EUS, then the procedure will be longer and may take up to two hours.

What Happens After EUS?

If you received sedatives, you will be monitored in the recovery area until most of the sedative medication’s effects have worn off.  If you had an upper EUS, your throat might be a little sore.  You might feel bloated because of the air and water that were introduced during the examination.

You’ll be able to eat after you leave the procedure area, unless you’re instructed otherwise.

Your doctor generally can inform you of the preliminary results of the procedure that day, but the results of some tests including biopsies, may take several days.

Risks

Although complications can occur, they are rare when doctors with specialized training and experience perform the EUS examination. Bleeding might occur at a biopsy site, but it’s usually minimal and rarely requires follow-up.  You might have a slight sore throat for a day or so.  Nonprescription anesthetic-type throat lozenges help soothe a sore throat.

Other potential but uncommon risks of EUS include a reaction to the sedatives used, aspiration of stomach contents into your lungs, infection, and complications from heart or lung diseases. One major but very uncommon complication of EUS is perforation.  This is a tear through the lining of the intestine that might require surgery to repair.

The possibility of complications increases slightly if a needle biopsy is performed during the EUS examination, including an increased risk of pancreatitis or infection. These risks must be balanced against the potential benefits of the procedure and the risks of alternative approaches to the condition.