Infective Endocarditis Diagnosis and Presentation

Clinical Features

Fever is the hallmark symptom of infective endocarditis, occurring in up to 90% of patients, typically accompanied by a heart murmur and embolic phenomena 1
The American College of Cardiology recommends considering infective endocarditis in patients with fever, even if it may be absent in elderly patients, those who received antibiotics before evaluation, immunocompromised individuals, or infections with less virulent organisms 1
New or changing heart murmur is found in up to 85% of patients, most commonly due to valvular insufficiency 2, 1
Heart failure can develop from acute valve destruction or progressive valvular damage, with a strength of evidence supported by the American Heart Association 3, 1

Pulmonary presentations, particularly in right-sided endocarditis, can include septic pulmonary infarcts and abscesses, as noted by the American College of Radiology 2
Ophthalmic presentations can include Roth spots, which are a significant diagnostic clue 1

The American Heart Association recommends obtaining at least 3 sets of blood cultures from separate sites before initiating antimicrobial therapy, with a strength of evidence level I 3
Echocardiography, starting with transthoracic echocardiography (TTE) and proceeding to transesophageal echocardiography (TEE) if clinical suspicion remains high, is the cornerstone diagnostic test, as recommended by the American College of Cardiology 1