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Circulating immune complexes in infective endocarditis

A S Bayer, A N Theofilopoulos, R Eisenberg

    The New England Journal of Medicine
    |December 30, 1976
    PubMed
    Summary
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    Immune complexes are frequently found in infective endocarditis patients, correlating with disease severity and extravalvular symptoms. Successful treatment leads to a decrease in immune complexes, supporting their role in infective endocarditis pathogenesis.

    Area of Science:

    • Immunology
    • Cardiology
    • Infectious Diseases

    Background:

    • Infective endocarditis (IE) is a serious infection affecting heart valves.
    • The role of immune complex deposition in IE pathogenesis requires further elucidation.

    Purpose of the Study:

    • To investigate the presence and significance of complement-containing circulating immune complexes (CICs) in patients with infective endocarditis.

    Main Methods:

    • Studied 29 patients diagnosed with infective endocarditis.
    • Measured serum levels of immune complexes and complement.
    • Correlated CIC levels with clinical parameters such as duration of illness, extravalvular manifestations, and type of endocarditis (right-sided vs. left-sided).

    Main Results:

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    • 97% of IE patients exhibited elevated CIC levels (>12 µg/mL), significantly higher than sepsis or control groups.
    • Higher CIC levels correlated with longer illness duration, extravalvular manifestations, and hypocomplementemia.
    • Right-sided endocarditis showed significantly higher CIC levels compared to left-sided IE.
    • Successful antimicrobial or surgical therapy led to a decrease in CIC levels, resolution of extravalvular signs, sterile blood cultures, and normalized complement levels.

    Conclusions:

    • Circulating immune complexes are prevalent in infective endocarditis.
    • Elevated CIC levels are associated with disease severity and specific clinical features.
    • The reduction of CICs with effective treatment suggests their involvement in IE pathogenesis.