infective endocarditis

Infective endocarditis is a microbial infection of the heart valve endothelium that can present acutely with severe sepsis and rapid valve destruction or subacutely with insidious constitutional symptoms, and its clinical manifestations arise from local cardiac damage causing valvular dysfunction as well as systemic complications from septic emboli and immune complex deposition affecting multiple organ systems. This condition is critically important for medical students to understand because it requires a high index of suspicion in patients with predisposing factors such as intravenous drug use, prosthetic valves, or congenital heart disease presenting with fever and new or changing heart murmurs, and delayed diagnosis leads to devastating complications including stroke, heart failure, and death. Mastery of the Duke criteria for diagnosis, recognition of classic peripheral stigmata like Osler nodes and Janeway lesions, and understanding the microbiological causes including Staphylococcus, Streptococcus, and the HACEK organisms are essential for timely identification and appropriate empiric antibiotic therapy.