CAMRT Radiography Practice Exam

Why is carbon dioxide used in barium enemas?

1. It is less irritating to the bowel

2. It produces clearer images

3. It is more rapidly absorbed

4. It enhances contrast

The correct answer is: It is more rapidly absorbed

The use of carbon dioxide in barium enemas is primarily due to its properties that promote better patient comfort and safety during the procedure. Carbon dioxide is a gas that can be rapidly absorbed by the body, which is advantageous in situations where minimizing discomfort is crucial. When carbon dioxide is used as a contrast agent, it is quickly absorbed by the bloodstream, reducing the risk of bowel perforation and minimizing the distension of the bowel. While some other gases may irritate the bowel or cause discomfort due to prolonged retention, carbon dioxide's rapid absorption helps to alleviate these concerns. This characteristic makes it particularly suitable when considering patient outcomes during radiographic imaging procedures, ensuring a smoother experience for those undergoing the examination. In contrast, the other options focus on aspects like irritation, image clarity, and contrast enhancement, which may not emphasize the key benefit of carbon dioxide's rapid absorption and its physiological impact during barium enemas.