Gingival bleeding, epistaxis and haematoma three days after gastroenteritis: the haemorrhagic lupus anticoagulant syndrome.

UNLABELLED: A 3 year and 9 month-old girl presented with gingival bleeding, epistaxis, and multiple haematomas 3 days after an acute episode of gastroenteritis. Prothrombin time and activated partial thromboplastin time were prolonged with reduced clotting activity of factor II (< 10%), VIII (<1%), IX (3%), XII (10%) and evidence of a high titre inhibitor. Prothrombin (factor II) level was below the detection limit, both in a functional and immunological assay. It did not increase after administration of vitamin K or fresh frozen plasma. Further studies revealed presence of a strong lupus anticoagulant and a specific IgG antibody against prothrombin. Factor VIII antigen levels also were reduced (31%), but to a lesser extent than functionally determined factor VIII (<1%). Blood coagulation normalised following clinical recovery 6 weeks after admission. The pathophysiology of this acquired inhibitor phenomenon (accelerated clearance of complexes of clotting factors and phospholipids) is discussed.

CONCLUSION

The haemorrhagic lupus anticoagulant syndrome (acquired hypoprothrombinaemia lupus anticoagulant syndrome) is a rare presentation of acquired bleeding diathesis in childhood. Since most cases in post-infectious children are asymptomatic, it might be underdiagnosed. In children with newly appearing bleeding symptoms or unclear prolonged prothrombin time or activated partial thromboplastin time, one has to consider this syndrome which could lead to relevant bleeding.