What is the function of glucagon in radiologic examination of the GI tract?

• A. To enhance barium absorption
• B. To slow peristalsis
• C. To reduce radiation exposure
• D. To increase gastrointestinal motility

Answer: (B)

Glucagon plays a critical role in radiologic examinations of the gastrointestinal (GI) tract by slowing peristalsis. This is important during imaging procedures such as fluoroscopy or barium studies, where it is essential to reduce the movement of the intestines to allow for clearer visualization of the structures and contents within the GI tract. By decreasing the contractions of the smooth muscle, glucagon helps to create a more stable environment, minimizing the chances of motion artifacts on the imaging and improving the diagnostic quality of the images.

This function is particularly valuable when imaging the stomach and intestines, as excessive movement can obscure details needed for an accurate diagnosis. Thus, the administration of glucagon may enhance the effectiveness of the radiologic examination by facilitating better image capture under controlled conditions.