Which congenital heart condition requires antibiotic prophylaxis if it is unrepaired or has residual shunts?

Which congenital heart condition requires antibiotic prophylaxis if it is unrepaired or has residual shunts?

• A. Unrepaired cyanotic congenital heart disease
• B. Repaired with no shunts
• C. Normal heart
• D. Aortic valve stenosis

Answer: (A)

The key idea is that antibiotic prophylaxis before dental procedures is reserved for heart conditions with ongoing abnormal blood flow that raises the risk of endocarditis, specifically unrepaired cyanotic defects or repaired defects with residual shunts or prosthetic material. In unrepaired cyanotic congenital heart disease, there is persistent right-to-left shunting and altered flow that makes the endocardium more susceptible to bacterial seeding from transient bacteremia during dental work. Giving antibiotics helps reduce the chance of bacteria establishing infection on heart valves or other endocardial surfaces. The other scenarios don’t fit this high-risk category: a heart that has been repaired with no remaining shunts carries a much lower risk and typically doesn’t require prophylaxis; a normal heart has no predisposition; and aortic valve stenosis is a valvular issue not a congenital condition with unrepaired shunt, so prophylaxis isn’t routinely recommended there.

The key idea is that antibiotic prophylaxis before dental procedures is reserved for heart conditions with ongoing abnormal blood flow that raises the risk of endocarditis, specifically unrepaired cyanotic defects or repaired defects with residual shunts or prosthetic material. In unrepaired cyanotic congenital heart disease, there is persistent right-to-left shunting and altered flow that makes the endocardium more susceptible to bacterial seeding from transient bacteremia during dental work. Giving antibiotics helps reduce the chance of bacteria establishing infection on heart valves or other endocardial surfaces.

The other scenarios don’t fit this high-risk category: a heart that has been repaired with no remaining shunts carries a much lower risk and typically doesn’t require prophylaxis; a normal heart has no predisposition; and aortic valve stenosis is a valvular issue not a congenital condition with unrepaired shunt, so prophylaxis isn’t routinely recommended there.