Sterile endocarditis vs Infective endocarditis
How to tell Sterile endocarditis and Infective endocarditis apart when a board question makes them look alike.
Sterile vegetations are culture-negative and context-driven; infective vegetations have fever and microbial evidence.
Side by side
Libman-Sacks occurs with SLE or antiphospholipid syndrome; marantic/nonbacterial thrombotic endocarditis occurs with malignancy or hypercoagulability.
Fever, positive blood cultures, peripheral stigmata, and inflammatory valve infection.
Sterile immune-complex or thrombotic vegetations form without organisms.
Microbes adhere to damaged endocardium or valves and produce infected vegetations.
SLE or antiphospholipid syndrome with vegetations on both valve surfaces points Libman-Sacks; pancreatic adenocarcinoma with emboli points marantic disease.
Persistent bacteremia, fever, splinter hemorrhages, Janeway lesions, or Osler nodes points infective endocarditis.
The trap
Vegetations on echo do not equal infection. Libman-Sacks endocarditis (SLE) gives small sterile vegetations on both surfaces of the valve and on the chordae; marantic (nonbacterial thrombotic) endocarditis gives sterile vegetations from a hypercoagulable state, classically advanced adenocarcinoma (pancreatic, lung, GI), with embolic strokes preceding the cancer diagnosis. Infective endocarditis adds fever, persistent bacteremia on three sets of cultures, and the peripheral stigmata (splinter hemorrhages, Janeway lesions, Osler nodes, Roth spots) that sterile forms lack.
The repair move
For valve vegetations, ask whether the stem gives organisms and fever or a sterile hypercoagulable-autoimmune context.
Try a free question
CoreA patient with systemic lupus erythematosus and antiphospholipid antibodies has sterile vegetations on both sides of the mitral valve. Which diagnosis is most likely?
Show answer and explanation
Answer: A. Libman-Sacks endocarditis. Libman-Sacks endocarditis is sterile verrucous valvular disease associated with SLE and antiphospholipid syndrome.
Why the other choices are tempting
- B. Marantic endocarditis is sterile thrombotic endocarditis associated with malignancy or cachexia.
- C. Infective endocarditis has microbial infection and positive cultures.
- D. Acute rheumatic fever follows group A strep and uses Jones criteria.
- E. Calcific aortic stenosis causes degenerative valve narrowing.
Flashcards
Tap a card to flip it.
What is the fastest separator for Sterile endocarditis vs Infective endocarditis?
Sterile vegetations are culture-negative and context-driven; infective vegetations have fever and microbial evidence.
What clue should make you choose Sterile endocarditis?
Libman-Sacks occurs with SLE or antiphospholipid syndrome; marantic/nonbacterial thrombotic endocarditis occurs with malignancy or hypercoagulability.
Quick answers
What is the fastest way to tell Sterile endocarditis from Infective endocarditis?
Sterile vegetations are culture-negative and context-driven; infective vegetations have fever and microbial evidence.
What is the key clue for Sterile endocarditis?
Libman-Sacks occurs with SLE or antiphospholipid syndrome; marantic/nonbacterial thrombotic endocarditis occurs with malignancy or hypercoagulability.
What is the key clue for Infective endocarditis?
Fever, positive blood cultures, peripheral stigmata, and inflammatory valve infection.
What is the common trap with Sterile endocarditis vs Infective endocarditis?
Vegetations on echo do not equal infection. Libman-Sacks endocarditis (SLE) gives small sterile vegetations on both surfaces of the valve and on the chordae; marantic (nonbacterial thrombotic) endocarditis gives sterile vegetations from a hypercoagulable state, classically advanced adenocarcinoma (pancreatic, lung, GI), with embolic strokes preceding the cancer diagnosis. Infective endocarditis adds fever, persistent bacteremia on three sets of cultures, and the peripheral stigmata (splinter hemorrhages, Janeway lesions, Osler nodes, Roth spots) that sterile forms lack.