The presence of infection-related antiphospholipid antibodies in infective endocarditis determines a major risk factor for embolic events

• Published in: Journal of the American College of Cardiology 1999-04, Vol.33 (5), p.1365-1371
• Main Authors: Kupferwasser, Leon Iri, Hafner, Gerd, Mohr-Kahaly, Susanne, Erbel, Raimund, Meyer, Jürgen, Darius, Harald
• Format: Article
• Language: English
• Subjects: Adult; Aged; Antibodies, Antiphospholipid - analysis; Bacterial diseases; Bacterial endocarditis, myocarditis and pericarditis. Bacterial diseases of the aorta, limb vessels and lymphatic vessels; Biological and medical sciences; Biomarkers - blood; Cerebral Angiography; Echocardiography, Transesophageal; Endocarditis, Bacterial - complications; Endocarditis, Bacterial - diagnosis; Endocarditis, Bacterial - immunology; Enzyme-Linked Immunosorbent Assay; Female; Fibrinolysis; Follow-Up Studies; Heart Valves - diagnostic imaging; Human bacterial diseases; Humans; Infectious diseases; Intracranial Embolism and Thrombosis - diagnosis; Intracranial Embolism and Thrombosis - etiology; Intracranial Embolism and Thrombosis - immunology; Male; Medical sciences; Middle Aged; Plasminogen Activator Inhibitor 1 - metabolism; Prognosis; Protein C - metabolism; Retrospective Studies; Risk Factors; Thrombin - metabolism; Tomography, X-Ray Computed; Ultrasonography, Doppler
• ISSN: 0735-1097; 1558-3597
• DOI: 10.1016/S0735-1097(99)00024-8

OBJECTIVES The impact of infection-associated antiphospholipid antibodies (APA) on endothelial cell activation, blood coagulation and fibrinolysis was evaluated in patients with infective endocarditis with and without major embolic events. BACKGROUND An embolic event is a common and severe complication of infective endocarditis. Despite the fact that APAs are known to be associated with infectious diseases, their pathogenic role in infective endocarditis has not been clearly defined. METHODS The relationship among the occurrence of major embolic events, echocardiographic vegetation size, endothelial cell activation, thrombin generation, fibrinolysis and APA was examined in 91 patients with definite infective endocarditis, including 26 patients with embolic events and 65 control subjects without embolic events. RESULTS Overall, 14.3% of patients exhibited elevated APA levels. Embolic events occurred more frequently in patients with elevated levels of APA than in patients without (61.5% vs. 23.1%; p = 0.008). Patients with elevated levels of APA showed higher levels of prothrombin-fragment F1+2 (p = 0.005), plasminogen-activator inhibitor 1 (p = 0.0002), von Willebrand factor (p = 0.002) and lower levels of activated protein C (p = 0.001) than patients with normal levels of APA. Thrombin generation and endothelial cell activation were both positively correlated with levels of APA. The occurrence of elevated APA levels was frequently associated with structural valve abnormalities (p = 0.01) and vegetations >1.3 cm (p = 0.002). CONCLUSIONS Infection-associated elevated APA levels in patients with infective endocarditis are related to endothelial cell activation, thrombin generation and impairment of fibrinolysis. This may contribute to the increased risk for major embolic events in these patients.