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Rheumatoid factor in acute bacterial endocarditis

J N Sheagren, C U Tuazon, C Griffin

    Arthritis and Rheumatism
    |September 1, 1976
    PubMed
    Summary
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    Rheumatoid factor was detected in 24% of Staphylococcus aureus endocarditis patients, compared to only 7% of healthy drug users. More severe endocarditis cases correlated with higher rheumatoid factor prevalence.

    Area of Science:

    • Infectious Diseases
    • Immunology
    • Rheumatology

    Background:

    • Endocarditis is a serious infection of the heart lining, often caused by Staphylococcus aureus in parenteral drug users.
    • Rheumatoid factor (RF) is an autoantibody associated with autoimmune diseases, but its role in infectious endocarditis is less understood.

    Purpose of the Study:

    • To investigate the prevalence and significance of rheumatoid factor (RF) in patients with Staphylococcus aureus endocarditis.
    • To determine if RF positivity is associated with disease severity in this patient population.

    Main Methods:

    • Sera from 55 patients with Staphylococcus aureus endocarditis and 30 noninfected drug users were tested for rheumatoid factor.
    • Patient data, including duration of fever post-antibiotic therapy, were analyzed to assess disease severity.

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    Main Results:

    • Rheumatoid factor was detected in 13 (24%) of 55 endocarditis patients.
    • Only 2 (7%) of 30 noninfected drug users tested positive for RF.
    • A higher likelihood of developing RF was observed in patients with more severe endocarditis, indicated by prolonged fever after antibiotic treatment.

    Conclusions:

    • Rheumatoid factor positivity is more common in patients with Staphylococcus aureus endocarditis than in noninfected drug users.
    • The presence of rheumatoid factor may serve as a potential indicator of more severe infectious endocarditis in parenteral drug abusers.