Pregnancies of women with epilepsy: a population-based study in Iceland.
OBJECTIVE
Women with epilepsy who become pregnant are commonly considered to be at high risk for complications during pregnancy or delivery. The offspring are also considered to have increased risk of perinatal mortality, congenital malformations, and maturational delay. Because few of these studies are population based, potential bias exists because of selection.


METHODS
We performed a historical population-based cohort study in Iceland to determine the prevalence of epilepsy among pregnant women, to identify pregnancy and delivery complications in women with epilepsy, and to determine the outcome of their pregnancies as compared with that in the general population of Iceland. We identified all women with active epilepsy who gave birth during a 19-year period in Iceland.


RESULTS
In this population, 3.3 in 1,000 pregnancies involve mothers with active epilepsy. The frequency of adverse events (AE) during pregnancy in the women with epilepsy is similar to that observed among all live births in the population, but cesarean section was performed twice as frequently as in the general population. Perinatal mortality rate and mean birth weight are not significantly different in the offspring of women with epilepsy as compared with rest of the population. The risk of major congenital malformations (MGM) is increased 2.7-fold over that expected when a mother is treated with antiepileptic drugs (AEDs) during a pregnancy.


CONCLUSIONS
Our study indicates that the rate of complications of pregnancy in mothers with active epilepsy is low and similar to that of the general population with epilepsy. Use of AEDs by the mother during pregnancy significantly increases the risk of MGM in the offspring.
Olafsson
E
E
Department of Neurology, National University Hospital, Reykjavik, Iceland.
Hallgrimsson
J T
JT
Hauser
W A
WA
Ludvigsson
P
P
Gudmundsson
G
G
D000014:Abnormalities, Drug-Induced / Q000453:epidemiology / Q000209:etiology; D000927:Anticonvulsants / Q000009:adverse effects / Q000627:therapeutic use; D002585:Cesarean Section / Q000706:statistics & numerical data; D015331:Cohort Studies; D000013:Congenital Abnormalities / Q000453:epidemiology; D004827:Epilepsy / Q000188:drug therapy / Q000453:epidemiology*; D005260:Female; D005313:Fetal Death / Q000453:epidemiology; D006801:Humans; D007055:Iceland / Q000453:epidemiology; D007226:Infant Mortality; D007231:Infant, Newborn; D007744:Obstetric Labor Complications / Q000453:epidemiology; D011247:Pregnancy; D011248:Pregnancy Complications / Q000188:drug therapy / Q000453:epidemiology*; D011256:Pregnancy Outcome / Q000453:epidemiology; D018566:Pregnancy, High-Risk; D015995:Prevalence; D012307:Risk Factors
D000927:Anticonvulsants