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Bacterial endocarditis due to Haemophilus parainfluenzae
Abstract:
We have evaluated three patients with Haemophilus parainfluenzae endocarditis. Two of the three had underlying heart disease. All presented with fever, chills and malaise of less than two weeks' duration. Mitral valve involvement led to congestive heart failure in two of three cases. Treatment proved difficult, despite normally adequate dosages of antibiotics to which the pathogens were sensitive in vitro (ampicillin, 12-20 gm/dag; gentamicin, 3-5 mg/kg/day). Two patients were cured; one died. There was a suggestion of an inverse correlation between vegetation mass and favorable clinical response. Review of the English literature disclosed 22 documented cases of H parainfluenzae endocarditis, including 12 in the antibiotic era.
Insights
Haemophilus parainfluenzae endocarditis is challenging to treat, even with sensitive antibiotics. Larger vegetation mass may correlate with poorer clinical outcomes in these rare heart valve infections.
Area of Science:
- Infectious Diseases
- Cardiology
- Microbiology
Background:
- Haemophilus parainfluenzae is a rare cause of infective endocarditis.
- Underlying heart disease increases risk.
- Prompt diagnosis and treatment are crucial.
Observation:
- Three patients with H. parainfluenzae endocarditis were evaluated.
- Common symptoms included fever, chills, and malaise.
- Mitral valve involvement frequently led to congestive heart failure.
Findings:
- Treatment was difficult despite in vitro antibiotic sensitivity.
- Two patients received ampicillin and gentamicin.
- Clinical response may be inversely correlated with vegetation mass.
Implications:
- H. parainfluenzae endocarditis requires aggressive management.
- Further research into optimal treatment strategies is needed.
- Early detection of vegetation size may aid prognosis.