[Immunologic studies in the differential diagnosis of infectious endocarditis and septicemia without endocardiac lesion].

Differential diagnosis between infective endocarditis and septicemia without endocarditis remains a crucial clinical difficulty. Value of immunological data during those pathologies has been evaluated in a 2 year prospective study. Sixty-one patients, admitted in an internal medicine and infectious diseases unit for a documented infectious disease, were included. They were separated in three groups: group I (n = 21): demonstrated infective endocarditis; group II (n = 19): septicemia without endocarditis and group III (n = 21): non septicemic well-defined infectious disease. Following parameters were studied: immune circulating complexes, C reactive protein, erythrocyte sedimentation rate, fibrinogen, rheumatoid factor, antinuclear antibodies, Treponema pallidum serodiagnostic and cryoglobulinemia. There were no differences between the three studied groups. In particular, immune circulating complexes were present in respectively 67%, 58% and 62% of the patients of the three groups. So, presence or absence of immunologic abnormalities does not provide help for diagnosis of endocarditis in a febrile patient.