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Immunologic evaluation in infective endocarditis.

W C Forte1, A C Mario, A da Costa

  • 1Faculdade de Ciências Médicas, Santa Casa de Misericórdia de São Paulo, São Paulo, SP, Brazil.

Arquivos Brasileiros De Cardiologia
|February 15, 2001
PubMed
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Patients with infective endocarditis show a robust immune response, with higher T and B lymphocyte counts and immunoglobulin levels. However, some immune functions are decreased, suggesting a potential autoimmune component.

Area of Science:

  • Immunology
  • Infectious Diseases
  • Clinical Medicine

Background:

  • Infective endocarditis (IE) is a serious infection affecting heart valves.
  • Understanding the immune system's role in IE is crucial for diagnosis and treatment.

Purpose of the Study:

  • To investigate the peripheral blood immune response in patients diagnosed with infective endocarditis.
  • To compare immune parameters between IE patients and healthy controls.

Main Methods:

  • Studied 10 IE patients (20-50 years old) and 20 healthy controls.
  • Diagnosis confirmed by clinical presentation, echocardiogram, and pre-treatment hemoculture.
  • Exclusion criteria included atopy, malnutrition, autoimmune disease, and immunosuppressant/antibiotic use.

Related Experiment Videos

Main Results:

  • IE patients exhibited significantly elevated T and B lymphocytes, CD4+ and CD8+ cells, IgM, IgG, and C4 complement levels compared to controls.
  • No significant differences were observed in IgA levels or neutrophil oxidative metabolism.
  • A significant decrease in C3 complement, chemotaxis, and monocyte phagocytosis was noted.
  • Cryoglobulins (IgG, IgM, IgA, C3, C4) were detected in 66.6% of IE patients.

Conclusions:

  • Infective endocarditis patients generally maintain immunocompetence across most immune response sectors.
  • The findings suggest a potential autoimmune component may arise during the course of infective endocarditis.