Which condition would be least likely to require antibiotic prophylaxis before dental procedures?

• A. Normal healthy heart
• B. Unrepaired cyanotic CHD
• C. Prosthetic valve
• D. History of infective endocarditis

Answer: (A)

The main idea is that antibiotic prophylaxis before dental procedures is reserved for people with certain heart conditions that put them at high risk for infective endocarditis from transient bacteria entering the bloodstream during dental work.

A normal healthy heart has no predisposition to endocarditis, so antibiotics are not indicated for them before dental procedures. In contrast, unrepaired cyanotic congenital heart disease involves abnormal blood flow that increases the risk of endocarditis, a prosthetic valve provides a surface for bacteria to cling to, and a history of infective endocarditis signals a higher risk of recurrence. These conditions are why prophylaxis is recommended for them.

So, the choice least likely to require prophylaxis is the normal healthy heart.