Obstetric antiphospholipid syndrome and long term arterial thrombosis risk

Antiphospholipid syndrome (APS) is classified as the association of a thrombotic event and/or obstetric morbidity in patients persistently positive for antiphospholipid antibodies and/or lupus anticoagulant. To evaluate the incidence of subsequent thrombosis among women diagnosed with purely obstetric APS. We retrospectively reviewed and collected demographic and clinical data from the computerized charts of all patients with obstetric APS, from 1992 to 2017. Eligibility criteria included all women diagnosed with APS, according to the 2006 revised criteria, for whom the clinical manifestations were purely obstetric. The primary endpoint was the occurrence of subsequent thromboembolic events, following diagnosis of obstetric APS. The study included 115 women diagnosed with obstetric APS. During the study’s follow up period, 12 (10.4%) women developed thrombosis. Of the 12 women who developed thrombosis, 9 (75%) of the thrombotic events were arterial. The site of arterial thrombosis was cerebral in all cases. Venous thrombosis occurred in 3 (25%) women, including one in each of the following sites—pulmonary embolism, ovarian vein thrombosis and proximal leg deep vein thrombosis. Our data suggests that women with obstetric APS are at risk for subsequent long-term thrombosis, especially arterial cerebral events. We did not identify any clinical or laboratory unique features among women with obstetric APS who will eventually develop thrombosis.