When during the pregnancy is eclampsia most likely to occur?

Updated: Apr 18, 2019
  • Author: Michael G Ross, MD, MPH; Chief Editor: Ronald M Ramus, MD  more...
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Most cases of eclampsia present in the third trimester of pregnancy, with about 80% of eclamptic seizures occurring intrapartum or within the first 48 hours following delivery. Rare cases have been reported before 20 weeks' gestation or as late as 23 days’ postpartum. Other than early detection of preeclampsia, no reliable test or symptom complex predicts the development of eclampsia. In developed countries, many reported cases have been classified as unpreventable.

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