Cardiac condition is associated with highest risk for Infective Endocat'ditis?

Which Cardiac condition is associated with highest risk for Infective Endocat'ditis? 

A. Mitral Valve prolapsed without regurgitation. 

B.Ventricular Septal defect
C.Previous History of Endocarditis.
D.Coronary artery disease

Ans. (C) 

High risk

Prosthetic heart valve

Previous history of endocarditis

Probable Moderate risk

Mitral varve prolapse

Undiagnosed heart murmurs

Other risk factors include intravenous drug use, male gender. African-American race, and

pulmonary artery catheterization,

High Risk Cardiac lesions for which Endocarditis Prophylaxis is advised before Dental Procedure-

1. Prosthetic heart valve. 

2. Prior endocarditis 

3. Unrepaired cynotic congenital heart disease, including palliative

shunts or conduits, 

4. Completely repaired congenital heart defects during the 6 months after re-pair.

 5. Incompletely

repaired congenital heart disease with residual defects adjacent to prosthetic material

 6. Valvulopathy developing

after cardiac transplantation.