title: Changes in complement and coagulation factors in a patient suffering a severe anaphylactoid reaction to injected contrast material: some considerations of pathogenesis.
abstract: A patient, suffering a severe anaphylactoid reaction to contrast material injected for an intravenous pyelogram, developed a consumption coagulopathy and evidence of complement activation. Precontrast complement values suggested that the patient had been processing complement via the classical pathway, perhaps as a consequence of an earlier protracted Klebsiella infection. Following contrast injection, a precipitous fall in hemolytic complement (CH50) and in the concentration of the C1 esterase inhibitor (C1INH) developed, as well as a diminution in C4 and C3 with the evolution of C3 conversion products. The possible role that these changes might play in the pathogenesis of idiosyncratic reactions to contrast media is considered.
mesh_terms: D000328:Adult; D000707:Anaphylaxis / Q000097:blood / Q000139:chemically induced*; D001778:Blood Coagulation Disorders / Q000139:chemically induced; D003167:Complement Activation / Q000187:drug effects; D003174:Complement C1 Inactivator Proteins / Q000032:analysis; D003165:Complement System Proteins / Q000032:analysis; D003287:Contrast Media / Q000009:adverse effects*; D004342:Drug Hypersensitivity / Q000276:immunology*; D005260:Female; D006801:Humans; D013997:Time Factors; D014567:Urography
chemical_list: D003174:Complement C1 Inactivator Proteins; D003287:Contrast Media; D003165:Complement System Proteins