上部バリウム シリーズ: バリウム嚥下検査

A barium swallow is a diagnostic imaging procedure using barium sulfate, a radiopaque contrast material, to visualize the upper gastrointestinal tract including the esophagus, stomach, and duodenum. The barium appears bright white on X-rays, enabling detailed images of the upper digestive system to identify abnormalities, strictures, perforations, neoplasms, and hiatal hernias.

Fluoroscopy provides real-time video X-ray imaging during the barium swallow, allowing observation of dynamic processes such as swallowing and peristalsis of the esophagus and stomach. This real-time visualization captures comprehensive information about GI tract movement and function, complementing static X-ray images taken during the procedure.

A barium swallow diagnoses esophageal motility disorders, gastroesophageal reflux disease (GERD), hiatal hernias, esophageal strictures, perforations, neoplasms, and other structural abnormalities. It is commonly ordered for patients experiencing difficulty swallowing, reflux, unexplained weight loss, abdominal pain, or persistent vomiting symptoms.

Patients must maintain NPO (nothing by mouth) status for eight hours before the procedure and avoid smoking after midnight to prevent increased gastric secretions. They should remove all metal items such as jewelry and dentures from the radiograph field and inform healthcare providers of any contraindications like intestinal obstruction or pregnancy.

The patient consumes a liquid containing barium sulfate with a chalky consistency. Fluoroscopy observes real-time movement of barium through the GI tract while multiple X-rays are captured to gather comprehensive information. In some cases, a double-contrast technique involving gas may be used to more clearly outline the inner surface of the digestive tract.

Patients should drink plenty of fluids unless contraindicated to eliminate the barium and take prescribed cathartics. Stools will appear chalky and light-colored for 24-72 hours, which is normal. Patients should inform their physician if they do not expel the barium within 2 to 3 days.

Unlike endoscopic procedures such as esophagogastroduodenoscopy, a barium swallow is a non-invasive radiographic study that uses contrast imaging rather than direct visualization. It provides excellent structural imaging of the upper GI tract and complements other diagnostic approaches like gastrointestinal motility studies and virtual colonoscopy for comprehensive GI assessment.