Final answer:
A potential complication of endocarditis is Valvular disease. Endocarditis can damage the heart valves, potentially requiring surgical intervention.
Step-by-step explanation:
The student has asked about a potential complication of endocarditis, which is an infection of the endocardium, usually involving the heart valves. The correct answer to the question is D. Valvular disease. Endocarditis can lead to significant damage to the heart valves because of the inflammation and vegetations caused by the infection. This damage may result in fibrosis and other structural damages to the valves, potentially necessitating valve replacement surgery. Conditions such as Guillain-Barré syndrome and Myelodysplastic syndrome are unrelated to endocarditis. Ventricular-depolarization, typically, is not a complication associated with endocarditis.