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Abstract:
We describe a case of Hemophilus parainfluenzae endocarditis in a previously healthy 26-year-old man, and review 21 cases from the literature. Although H parainfluenzae is considered to be part of the normal flora of the upper respiratory tract in man, it can cause serious disease. H parainfluenzae endocarditis is often difficult to diagnose. The patients generally had a history of recent infection of the upper respiratory tract, but a majority denied previous heart disease. Upon entry to the hospital, after an average of seven weeks of febrile illness, nearly one third of patients were found not to have a heart murmur. Furthermore, the organism was often difficult to grow from blood cultures, a problem possibly related to the need for accessory growth factors. The mortality with modern therapy was 12%, and the major complication was cerebral embolus. Antibiotic therapy of choice is ampicillin, generally used together with an aminoglycoside, though ampicillin alone may be sufficient.
Insights
Hemophilus parainfluenzae endocarditis can affect healthy individuals and is challenging to diagnose, often presenting without typical heart murmurs. Early diagnosis and appropriate antibiotic treatment, such as ampicillin, are crucial for improving patient outcomes.
Area of Science:
- Infectious Diseases
- Cardiology
- Microbiology
Background:
- Hemophilus parainfluenzae, a common upper respiratory tract commensal, can cause severe infections like endocarditis.
- Endocarditis caused by H. parainfluenzae is rare but can occur in previously healthy individuals.
Observation:
- A case of H. parainfluenzae endocarditis in a young, healthy male is presented, alongside a review of 21 literature cases.
- Patients often present with prolonged febrile illness (average 7 weeks) and may lack a heart murmur, complicating diagnosis.
- H. parainfluenzae can be difficult to culture from blood, potentially due to nutritional requirements.
Findings:
- H. parainfluenzae endocarditis is diagnostically challenging, with a significant proportion of patients initially lacking a heart murmur.
- Cerebral embolus is a major complication, and the mortality rate with modern therapy remains at 12%.
Implications:
- Highlights the importance of considering H. parainfluenzae in the differential diagnosis of endocarditis, especially in patients with recent respiratory infections.
- Suggests ampicillin, often with an aminoglycoside, as the preferred antibiotic regimen, though ampicillin monotherapy may suffice.
- Underscores the need for improved diagnostic strategies and awareness of this pathogen in infective endocarditis.