Endoscopic Ultrasound

Endoscopic Ultrasound

EUS is a type of endoscopic examination. It involves inserting a thin tube into the mouth and stomach and the first part of the small intestine. At the end of the tube is a small ultrasound probe that emits sound waves. These sound waves are reflected from surrounding structures such as stomach, small intestine, pancreas, bile ducts and liver. These sound waves are then captured by the probe and converted into black and white images for later interpretation by your doctor. The procedure is performed under sedoanalgesia and usually takes 20 to 45 minutes.

Why is EUS Applied?

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

EUS is also used to evaluate known abnormalities, including lumps or lesions detected during a previous endoscopy or seen in x-ray tests such as a computed tomography (CT) scan. EUS can be used to diagnose pancreatic, bile duct, and gallbladder diseases when other tests are inconclusive or conflicting.

How is EUS performed?

Like all other procedures in our gastroenterology unit, endoscopic ultrasound is performed under sedoanalgesia by anesthesia. The procedure starts by laying the patient on left side. After the patient is put to sleep, your gastroenterologist will advance the ultrasound endoscope through your mouth, esophagus, and stomach into the duodenum. The used endoscopic ultrasound device  does not prevent you from breathing during the procedure. The process usually takes less than 60 minutes. Since the procedure is performed under sedation, patients do not remember the procedure after the procedure.

In Which Diseases Is Endoscopic Ultrasound (EUS) Used?

  • It is used to drain the bile ducts blocked due to cancer into the stomach or small intestine with EUS or stenting
  • Esophageal cancer, stomach cancer, rectal cancer, bile duct cancer, pancreatic cancer diagnosis, biopsy, detection of cancer at an early stage, investigation of recurrence findings in postoperative follow-up, cancer involvement in lymph nodes and vessels around the rectum (prostate, bladder, vagina) Examining and determining the grade of the tumor (T1, T2, T3, T4)
  • Lymphoma
  • Barrett esophagus
  • Bile duct stones
  • Sarcoidosis
  • Neuroendocrine tumors,
  • Pancreatitis and pancreatic cysts
  • Anal fistula
  • Gas and fecal incontinence
  • Biopsy of masses in the liver

Why is EUS Used in Cancer Patients?

EUS helps your doctor determine the extent to which certain cancers in the digestive and respiratory tract have spread. EUS allows your doctor to accurately assess the depth of the cancer and whether it has spread to adjacent lymph nodes or nearby vital structures such as large blood vessels. In some patients, EUS may be used to obtain a needle biopsy of a lump or lesion to help your doctor determine the appropriate treatment.

How to Preparation Before EUS Process?

For EUS, usually no food or drink should be consumed 6 hours prior to the examination. Your doctor will tell you when to stop eating and drink, and if you have medications that you need to take regularly, whether you can use them before the procedure.

For rectal or colon EUS, your doctor will instruct you to either consume a colon cleansing solution or follow a clear liquid diet combined with laxatives or enemas prior to the examination. The doctor’s instructions must be followed carefully, otherwise the procedure may need to be rearranged.

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