Acute infective endocarditis vs Subacute infective endocarditis
How to tell Acute infective endocarditis and Subacute infective endocarditis apart when a board question makes them look alike.
Acute infective endocarditis is fast, toxic, and destructive; subacute infective endocarditis is slower, constitutional, and usually on damaged valves.
Side by side
Abrupt fever, sepsis, and destructive valve infection, often from Staphylococcus aureus including on previously normal valves.
Indolent low-grade fever, fatigue, weight loss, and murmur over weeks to months, often from viridans streptococci on damaged valves.
High-virulence organisms rapidly invade and destroy valve tissue.
Lower-virulence organisms colonize abnormal endocardial surfaces and grow more slowly.
S aureus bacteremia, injection drug use, acute heart failure, or rapidly worsening regurgitation points acute infective endocarditis.
Dental manipulation, poor dentition, preexisting valve disease, and viridans streptococci point subacute infective endocarditis.
The trap
A new murmur and positive cultures can occur in both, so tempo and organism virulence decide.
Watch it explained
The repair move
For infective endocarditis, name the speed first, then organism and valve substrate.
Try a free question
CoreA patient who injects drugs develops abrupt high fever, sepsis, and a new murmur. Blood cultures grow Staphylococcus aureus. Which endocarditis pattern best fits?
Show answer and explanation
Answer: A. Acute infective endocarditis. Acute infective endocarditis is rapid and destructive, often due to S aureus, including on previously normal valves.
Why the other choices are tempting
- B. Subacute infective endocarditis is slower and often involves viridans streptococci on damaged valves.
- C. Libman-Sacks is sterile vegetations associated with SLE/antiphospholipid syndrome.
- D. Marantic endocarditis is sterile thrombotic vegetations associated with malignancy or hypercoagulability.
- E. Rheumatic heart disease is chronic immune-mediated valve damage after rheumatic fever.
Flashcards
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What is the fastest separator for Acute infective endocarditis vs Subacute infective endocarditis?
Acute infective endocarditis is fast, toxic, and destructive; subacute infective endocarditis is slower, constitutional, and usually on damaged valves.
What clue should make you choose Acute infective endocarditis?
Abrupt fever, sepsis, and destructive valve infection, often from Staphylococcus aureus including on previously normal valves.
Quick answers
What is the fastest way to tell Acute infective endocarditis from Subacute infective endocarditis?
Acute infective endocarditis is fast, toxic, and destructive; subacute infective endocarditis is slower, constitutional, and usually on damaged valves.
What is the key clue for Acute infective endocarditis?
Abrupt fever, sepsis, and destructive valve infection, often from Staphylococcus aureus including on previously normal valves.
What is the key clue for Subacute infective endocarditis?
Indolent low-grade fever, fatigue, weight loss, and murmur over weeks to months, often from viridans streptococci on damaged valves.
What is the common trap with Acute infective endocarditis vs Subacute infective endocarditis?
A new murmur and positive cultures can occur in both, so tempo and organism virulence decide.