Radiation Safety

Radiation safety—how does the MBSS measure up?
I had such a cool conversation about radiation the other day—I just had to share! I have been working with a great RPA (Radiology Practitioner Assistant) for a while now, and we grabbed lunch together and of course, the conversation turned to interesting cases we had seen lately. I mentioned a study that was really complicated and took more time than usual and made a little joke about my anxiety over radiation exposure to the patient. She looked me dead in the eye and said, “You do know that your MBS studies expose patients to far less radiation than a ton of other procedures, right? Plus, you use a protocol, which can help decrease it even more. I mean, be safe, be efficient, but get the info you need!”
This was such a different perspective than I had from other jobs, I just had to dig in. I looked at the fantastic body of work from Dr. Heather Bonilha and colleagues, and on average, MBSS in adults resulted in about 0.2 millisieverts (mSv) of radiation exposure. Compare that to the published averages by the American College of Radiology to a Barium Enema (Lower GI X-ray) exposure of 6 mSv, or Computed Tomography (CT) of the abdomen and pelvis, with and without contrast material, of 15.4 mSv!
Add to this Dr. Bonilha’s further research that shows the real risk to our diagnostic accuracy by decreasing the pulse rate, which is a frequent method suggested to decrease radiation exposure, as well as her work that does support the use of protocols (like the MBSImP™©) to reduce exposure. I had a brand new confidence in my understanding of radiation exposure.
For more information, including a deeper dive into the health risks of radiation exposure, check out these papers:
Radiation Risks to Adult Patients Undergoing Modified Barium Swallow Studies1
Radiation Exposure in Modified Barium Swallow Studies2
Impact of Reducing Fluoroscopy Pulse Rate on Adult Modified Barium Swallow Studies3
A nice chart from RadiologyInfo.org that lists exposure during various procedures4
References:
1. Bonilha HS, Huda W, Wilmskoetter J, Martin-Harris B, et al. Radiation risks to adult patients undergoing modified barium swallow studies. Dysphagia. 2019 Dec;34(6):922-929.
2. Bonilha HS, Martin-Harris B, O’Rourke AK, et al. Radiation exposure in modified barium swallow studies. Curr Opin Otolaryngol Head Neck Surg. 2020 Dec;28(6):371-375.
3. Bonilha HS, Reedy EL, Wilmskoetter J, et al. Impact of Reducing fluoroscopy pulse rate on adult modified barium swallow studies. Dysphagia. 2024 Aug;39(4):632-641.
4. Radiation Dose from X-Ray and CT Exams. RadiologyInfo.org, 2022. https://www.radiologyinfo.org/en/info/safety-xray. Accessed February 4, 2025.
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INDICATIONS AND USAGE | IMPORTANT SAFETY INFORMATION
VARIBAR® (barium sulfate)
IMPORTANT SAFETY INFORMATION:
For Oral Administration. This product should not be used in patients with known or suspected perforation of the GI tract, known obstruction of the GI tract, high risk of aspiration, or hypersensitivity to barium sulfate products. Rarely, severe allergic reactions of anaphylactoid nature have been reported following administration of barium sulfate contrast agents. Aspiration may occur during the modified barium swallow examination, monitor the patient for aspiration.
INDICATIONS AND USAGE | IMPORTANT SAFETY INFORMATION
VARIBAR® (barium sulfate)
INDICATIONS
VARIBAR® THIN HONEY (barium sulfate) oral suspension, VARIBAR® NECTAR (barium sulfate) oral suspension, and VARIBAR® THIN LIQUID (barium sulfate) oral suspension are radiographic contrast agents indicated for use in modified barium swallow examinations to evaluate the oral and pharyngeal function and morphology in adult and pediatric patients.
VARIBAR® HONEY (barium sulfate) oral suspension and VARIBAR® PUDDING (barium sulfate) oral paste are radiographic contrast agents indicated for use in modified barium swallow examinations to evaluate the oral and pharyngeal function and morphology in adult and pediatric patients 6 months of age and older.
IMPORTANT SAFETY INFORMATION
CONTRAINDICATIONS
These products should not be used in patients with known or suspected perforation of the gastrointestinal (GI) tract; known obstruction of the GI tract; high risk of GI perforation such as those with a recent GI perforation, acute GI hemorrhage or ischemia, toxic megacolon, severe ileus, post GI surgery or biopsy, acute GI injury or burn, or recent radiotherapy to the pelvis; high risk of aspiration such as those with known or suspected tracheo-esophageal fistula or obtundation; known severe hypersensitivity to barium sulfate or any of the excipients of the product used.
WARNINGS AND PRECAUTIONS
Hypersensitivity Reactions
Barium sulfate preparations contain a number of excipients, including natural and artificial flavors, and may induce serious hypersensitivity reactions. The manifestations include hypotension, bronchospasm and other respiratory impairments, and dermal reactions including rashes, urticaria, and itching. A history of bronchial asthma, atopy, food allergies, or a previous reaction to a contrast agent may increase the risk for hypersensitivity reactions. Emergency equipment and trained personnel should be immediately available for treatment of a hypersensitivity reaction.
Intra-abdominal Barium Leakage
The use of VARIBAR PRODUCTS is contraindicated in patients at high risk of perforation of the GI tract. Administration of VARIBAR PRODUCTS may result in leakage of barium from the GI tract in the presence of conditions such as carcinomas, GI fistula, inflammatory bowel disease, gastric or duodenal ulcer, appendicitis, or diverticulitis, and in patients with a severe stenosis at any level of the GI tract, especially if it is distal to the stomach. The barium leakage has been associated with peritonitis and granuloma formation.
Delayed Gastrointestinal Transit and Obstruction
Orally administered barium sulfate may accumulate proximal to a constricting lesion of the colon, causing obstruction or impaction with development of baroliths (inspissated barium associated with feces) and may lead to abdominal pain, appendicitis, bowel obstruction, or rarely perforation. Patients with the following conditions are at higher risk for developing obstruction or baroliths: severe stenosis at any level of the GI tract, impaired GI motility, electrolyte imbalance, dehydration, on a low residue diet, taking medications that delay GI motility, constipation, pediatric patients with cystic fibrosis or Hirschsprung disease, and the elderly. To reduce the risk of delayed GI transit and obstruction, patients should maintain adequate hydration after the barium sulfate procedure. When administering VARIBAR PUDDING, consider the administration of laxatives.
Aspiration Pneumonitis
The use of VARIBAR PRODUCTS is contraindicated in patients with trachea-esophageal fistula. Oral administration of barium is associated with aspiration pneumonitis, especially in patients with a history of food aspiration or with compromised swallowing mechanism. Vomiting following oral administration of barium sulfate may lead to aspiration pneumonitis. In patients at risk for aspiration, begin the procedure with a small ingested volume of VARIBAR PRODUCTS. Monitor the patient closely for aspiration, discontinue administration of VARIBAR PRODUCTS if aspiration is suspected, and monitor for development of aspiration pneumonitis.
Systemic Embolization
Barium sulfate products may occasionally intravasate into the venous drainage of the GI tract and enter the circulation as a "barium embolus" leading to potentially fatal complications which include systemic and pulmonary embolism, disseminated intravascular coagulation, septicemia and prolonged severe hypotension. Although this complication is exceedingly uncommon after oral administration of a barium sulfate suspension, monitor patients for potential intravasation when administering barium sulfate.
ADVERSE REACTIONS
The most common adverse reactions are nausea, vomiting, diarrhea, and abdominal cramping. Serious adverse reactions and fatalities include aspiration pneumonitis, barium sulfate impaction, intestinal perforation with consequent peritonitis and granuloma formation, vasovagal and syncopal episodes.
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit www.fda.gov/medwatch or call 1-800-FDA-1088.
Please click here for full Prescribing Information for VARIBAR® THIN LIQUID (barium sulfate) oral suspension.
Please click here for full Prescribing Information for VARIBAR® THIN HONEY (barium sulfate) oral suspension.
Please click here for full Prescribing Information for VARIBAR® NECTAR (barium sulfate) oral suspension.
Please click here for full Prescribing Information for VARIBAR® HONEY (barium sulfate) oral suspension.
Please click here for full Prescribing Information for VARIBAR® PUDDING (barium sulfate) oral paste.
VARIBAR is manufactured by E-Z-EM Canada Inc., for E-Z-EM, Inc., a subsidiary of Bracco Diagnostics Inc., Princeton, NJ 08540.
VARIBAR is a registered trademark of E-Z-EM, Inc.
INDICATIONS AND USAGE | IMPORTANT SAFETY INFORMATION
VARIBAR® (barium sulfate)
IMPORTANT SAFETY INFORMATION:
For Oral Administration. This product should not be used in patients with known or suspected perforation of the GI tract, known obstruction of the GI tract, high risk of aspiration, or hypersensitivity to barium sulfate products. Rarely, severe allergic reactions of anaphylactoid nature have been reported following administration of barium sulfate contrast agents. Aspiration may occur during the modified barium swallow examination, monitor the patient for aspiration.
Talk Soon,