SUCCESSFUL CHILDBIRTH BY A PATIENT WITH CONGENITAL FACTOR-XI DEFICIENCY AND AN ACQUIRED INHIBITOR

Acquired inhibitors in factor XI deficiency (FXI) are rare. The presen ce of an inhibitor during pregnancy poses a potential haemorrhagic ris k to the fetus. We report an uncomplicated pregnancy and successful ch ildbirth by a woman with congenital FXI deficiency and an acquired inh ibitor, and discuss the persistence of residual FXI activity in the pr esence of an inhibitor.