[Antiphospholipid syndrome. 20 cases].

Objectives: We analyzed the clinical and biological characteristics as well as the clinical course and outcome observed in 20 patients with antiphospholipid antibodies and clinical signs including thrombosis or repeated spontaneous abortion to better identify the recently described antiphospholipid syndrome.

Methods: We retrospectively studied all patients observed in our unit from 1981 to 1992 who fulfilled the following inclusion criteria: a) at least one episode of arterial or venous thrombosis and/or repeated spontaneous abortions, b) positive for antiphospholipid antibodies.

Results: Twenty patients were included, 3 with systemic lupus erythematosus (according to the American Rheumatism Association criteria). Arterial or venous thrombosis occurred in 9 and 16 respectively, including exceptional cases of cerebral phlebitis and thrombosis of dermal capillaries. High blood pressure was recorded in 8. Only 1 or 2 types of antiphospholipid antibodies were found in most patients. Anticardiolipin, a circulating anticoagulant and a false-positive Bordet-Wassermann reaction were found together in only 3 out of 16. In addition, the antibody level varied independently from the thrombotic events. There was no case with a clinical course from primary antiphospholipid syndrome to systemic erythromatosus lupus. The effect to treatment on occurrence of new thrombotic events was studied. Three patients suffered one or more haemorrhagic events during antivitamin K treatment.

Conclusion: It is difficult to establish a differentiation between primary antiphospholipid syndrome, systemic lupus erythematosus and lupus-like syndromes, and precise methods of identifying antiphospholipid antibodies should be further developed.