Pregnancies occurring in women with antiphospholipid antibodies are at
significantly increased risk of miscarriage, prematurity, intrauterin
e growth retardation and preeclampsia. Insights into the pathological
basis of these conditions suggest that antiphospholipid antibodies imp
air embryonic implantation and in later gestations cause thrombosis of
the uteroplacental vasculature. This offers a rational basis for thro
mboprophylaxis during pregnancy.