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[Endocarditis with unusual causative agents].

D Schmidt¹, F Nager

¹Medizinische Klinik des Kantonsspitals Luzern.

Schweizerische Medizinische Wochenschrift

|December 26, 1987

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Infective endocarditis is often caused by common bacteria, but rare organisms can also be responsible. Increased awareness of unusual pathogens, like Coxiella burnetii, can improve diagnosis and outcomes for culture-negative cases.

Area of Science:

Infectious Diseases
Microbiology
Cardiology

Background:

A retrospective analysis of 601 infective endocarditis cases from 1947-1985 at two Swiss hospitals.
Identified common causative agents and investigated culture-negative endocarditis cases.

Observation:

Streptococci, enterococci, and staphylococci were the most frequent pathogens.
Over 25% of cases had negative blood cultures.
Six patients presented with rare etiological agents: Coxiella burnetii (Q fever endocarditis), Hemophilus parainfluenzae, Corynebacterium bovis, Brucella melitensis, and Aspergillus terreus.

Findings:

Detailed clinical and microbiological characteristics of rare organism endocarditis were documented.
Comparison with existing literature highlighted diagnostic and therapeutic challenges.

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Q fever endocarditis exhibited a notoriously atypical clinical course.

Implications:

Emphasizes the importance of considering unusual pathogens in infective endocarditis, particularly in culture-negative scenarios.
Suggests that heightened clinical suspicion for rare organisms can reduce "culture-negative" cases.
Improved diagnostic awareness may lead to better patient prognoses and treatment strategies.