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Cardiobacterium hominis endocarditis.

M DeGuise1, G Lalonde, Y Girouard

  • 1Department of Medicine, Hôpital du Sacré-Coeur de Montréal, Québec.

The Canadian Journal of Cardiology
|December 1, 1990
PubMed
Summary
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A rare case of infective endocarditis caused by Cardiobacterium hominis, a fastidious oral bacterium, was diagnosed in a 53-year-old man. This highlights the importance of considering unusual pathogens in culture-negative endocarditis.

Area of Science:

  • Infectious Diseases
  • Cardiology
  • Microbiology

Background:

  • Infective endocarditis (IE) is a serious infection of the heart valves.
  • Fastidious organisms, including oral flora, can cause IE but are identified in less than 5% of cases.
  • Cardiobacterium hominis is a pleomorphic, facultative anaerobic, Gram-negative bacillus found in normal human oral flora.

Observation:

  • A 53-year-old male presented with nonspecific symptoms.
  • Clinical findings included aortic valve regurgitation and hepatosplenomegaly.
  • Blood cultures revealed Cardiobacterium hominis after a prolonged incubation period of 14 days.

Findings:

  • This case represents one of approximately 40 reported instances of endocarditis caused by Cardiobacterium hominis.

Related Experiment Videos

  • Cardiobacterium hominis is an uncommon cause of infective endocarditis, accounting for less than 5% of cases.
  • The successful identification of C. hominis underscores the challenges associated with culturing fastidious bacteria.

    • Implications:

    • Clinicians should consider rare oral bacteria like Cardiobacterium hominis in the differential diagnosis of infective endocarditis, especially with prolonged incubation times.
    • This case contributes to the limited literature on C. hominis endocarditis, aiding in understanding its clinical presentation and diagnostic challenges.
    • Further research into the pathogenicity and optimal diagnostic strategies for fastidious organisms in endocarditis is warranted.