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Fibrinolytic pattern in recurrent spontaneous abortions: no relationship between hypofibrinolysis and anti-phospholipid antibodies.
American Journal of Hematology 1994 December
Patients with antiphospholipid antibodies may suffer from thrombotic events and recurrent spontaneous abortions. A defective fibrinolytic potential has been described in women with recurrent fetal losses. We investigated the prevalence of anticardiolipin antibodies and of various fibrinolytic abnormalities in 64 females with a history of at least two abortions of unknown origin. Anticardiolipin antibodies were present in the serum of 31 patients (48.4%). The overall prevalence of fibrinolytic disorders was 67.2% (43 cases) and resulted significantly higher than that of aCL positivity (P = 0.03). In most of cases the impaired fibrinolytic potential after venous occlusion test was due to increased PAI-1 levels; only in a few instances a defective fibrinolytic response was due to reduced t-PA release, a combined defect or an intrinsic fibrinolytic deficiency. After division of patients in two groups on the basis of the aCL presence, the distribution of different fibrinolytic defects was similar in aCL positive and negative women, suggesting the lack of correlation between hypofibrinolysis and aCL antibodies. Plasminogen abnormalities resulted compatible with congenital hypoplasminogenemia in two aCL negative women, whereas in four aCL positive patients they were suggestive for acquired dysplasminogenemia. Our results indicate that patients with recurrent spontaneous abortions may present fibrinolytic disorders, which occur independently and more often than aCL positivity. An accurate investigation of the fibrinolytic potential, and, namely, of PAI-1 levels, should be included in the study of females suffering from repeated fetal losses.
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