In bacterial endocarditis, the infection seeds itself on which cardiac structures?

In bacterial endocarditis, the infection seeds itself on which cardiac structures?

• A. The myocardium
• B. The valves
• C. The pericardium
• D. The arterioles

Answer: (B)

Bacterial endocarditis primarily involves the valve surfaces of the heart. When bacteria enter the bloodstream, they tend to adhere to damaged or abnormal endothelium on heart valves and become embedded in sterile platelet-fibrin deposits that form there. This interaction creates vegetations, which are the hallmark lesions of endocarditis and most commonly affect the mitral and aortic valves (left-sided valves). In contrast, involvement of the myocardium or pericardium is more characteristic of myocarditis or pericarditis, not endocarditis, and arterioles are not typical sites of initial infection. So the infection seeds itself on the valves.

Bacterial endocarditis primarily involves the valve surfaces of the heart. When bacteria enter the bloodstream, they tend to adhere to damaged or abnormal endothelium on heart valves and become embedded in sterile platelet-fibrin deposits that form there. This interaction creates vegetations, which are the hallmark lesions of endocarditis and most commonly affect the mitral and aortic valves (left-sided valves). In contrast, involvement of the myocardium or pericardium is more characteristic of myocarditis or pericarditis, not endocarditis, and arterioles are not typical sites of initial infection. So the infection seeds itself on the valves.