Why is nitroglycerin administered during coronary angiography?

Why is nitroglycerin administered during coronary angiography?

• A. To prevent or treat vasospasm and facilitate smooth catheter manipulation and coronary visualization
• B. To anesthetize the vessels
• C. To treat contrast-induced nephropathy
• D. To reduce radiation exposure and particle dispersion during injection

Answer: (A)

Nitroglycerin is used during coronary angiography to prevent or treat vasospasm and to make catheter advancement and visualization easier. Its rapid vasodilator effect relaxes the smooth muscle in the coronary arteries, widening the lumen and reducing spasm that can be triggered by catheter manipulation. This keeps the arteries from narrowing during contrast injection, allows smoother catheter control, and yields clearer, more reliable images of the coronary vessels. It’s not about anesthesia, contrast nephropathy, or reducing radiation/particle dispersion.

Nitroglycerin is used during coronary angiography to prevent or treat vasospasm and to make catheter advancement and visualization easier. Its rapid vasodilator effect relaxes the smooth muscle in the coronary arteries, widening the lumen and reducing spasm that can be triggered by catheter manipulation. This keeps the arteries from narrowing during contrast injection, allows smoother catheter control, and yields clearer, more reliable images of the coronary vessels. It’s not about anesthesia, contrast nephropathy, or reducing radiation/particle dispersion.