barium sulfate

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 (Ba) [bar´e-um]
a chemical element, atomic number 56, atomic weight 137.34. (See Appendix 6.) Ingestion of excessive amounts can be toxic, occasionally resulting in fatal hypokalemia and paralysis.
barium sulfate a water-insoluble salt used as an opaque contrast medium for x-ray examination of the digestive tract.
barium test x-ray examination using a barium mixture to help locate disorders in the esophagus, stomach, duodenum, and small and large intestines. Such conditions as peptic ulcer, benign or malignant tumors, colitis, or enlargement of organs that might be causing pressure on the stomach may be readily identified with the use of barium tests. If perforation exists or is suspected, the barium test should not be administered. It is important to evacuate the barium completely following the study; a mild laxative is usually prescribed for this purpose.

Barium sulfate is a harmless chalky, water-insoluble compound that does not permit x-rays to pass through it. Taken before or during an examination, it causes the intestinal tract to stand out in silhouette when viewed through a fluoroscope or seen on an x-ray film.

Two main types of tests are conducted with the use of barium: the barium meal or barium swallow, for radiologic examination of the upper gastrointestinal tract, and the barium enema for examination of the lower gastrointestinal tract.
Barium test: Barium meal and follow-through. Normal stomach and small bowel. From Aspinall and Taylor-Robinson, 2001.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

bar·i·um sul·fate

given as a suspension orally, rectally, or through a tube, for radiographic demonstration of a part of the gastrointestinal tract. See: enteroclysis, barium enema.
See also: barium meal.
Farlex Partner Medical Dictionary © Farlex 2012

Barium sulfate

A barium compound used during a barium enema to block the passage of x rays during the exam.
Mentioned in: Barium Enema
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Additionally, VARIBAR THIN LIQUID (barium sulfate) for oral suspension completes the new drug approval (NDA) Programme of the VARIBAR line of imaging agents for use in modified barium swallow studies.
Indications and Usage: VARIBAR THIN LIQUID (barium sulfate) for oral suspension is indicated for use in modified barium swallow examinations to evaluate the oral and pharyngeal function and morphology in adult and pediatric patients.
Two forms of barium, barium sulfate and barium carbonate, are often found in nature as underground ore deposits.
Flow rate (mL/s) through the Bencton & Dickinson and Saldanha Rodrigues syringes of barium sulfate (100mL) diluted with water at 1g/3ml, 1g/1ml and 1g/1ml added with 1.2g f food thickener measured immediately after preparation (time 0), and at 8 hours and 24 hours after preparation.
Severe barium sulfate aspirationinto the lung: Clinical presentation, prognosis and therapy.
A barium sulfate alternative was then conducted, and also permitted clear radiographic imaging of muscular nerve branches.
Barium sulfate (or Sulfate) is the inorganic compound with the chemical formula BaSO4.
Barium sulfate is widely used for gastrointestinal imaging and harmful complications are rare.
However, a subsequent NRC investigation released in 1988 did say dumping the barium sulfate and soil from Latty Avenue in West Lake was "not authorized."
After overnight fasting, each volunteer orally ingested compression coated barium sulfate tablet with 500 mL of water.
The 200-acre site encompasses several inactive areas of closed sanitary and demolition fills, including two areas where leached barium sulfate waste from World War II-era nuclear weapons manufacturing was buried in the 1970s; and the separate Bridgeton Sanitary Landfill.