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Women with histories of preeclampsia are desperate to know their chances of developing it again in subsequent pregnancies. In this large, population-based study, investigators examined data from the Medical Birth Registry of Norway to determine the prevalence of preeclampsia among 550,218 women who delivered at least twice between 1967 and 1998. Women with three or more fetuses in the first pregnancy and two or more in the second were excluded.
Preeclampsia was diagnosed if women had hypertension and proteinuria or developed eclampsia at any stage of pregnancy. The prevalence of preeclampsia was 3.7% in the first pregnancy and 1.7% in the second. Preeclampsia prevalence in the first pregnancy was threefold higher in twin gestations than in s…