Cardiac arrest occurs in approximately one in 30,000 women in late pregnancy. Maternal mortality is caused by venous thromboembolism, severe preeclampsia or eclampsia, sepsis, amniotic fluid embolism, haemorrhage, trauma, iatrogenic causes including anaesthesia and drug errors or allergy, and congenital or acquired heart disease.
Urgent hysterotomy or Caesarean section should be considered in the pregnant woman who has a cardiac arrest.  If early<unk>  fails, birth of the fetus may improve both the maternal and the fetal chances of survival.  Infants over 24-25 weeks gestation have the best chance of survival if birthed within 5 minutes of maternal cardiac arrest.  It is recommended that hysterotomy or Caesarean section be initiated within 4 minutes after a cardiac arrest unless there has been a successful<unk>  and maternal perfusion restored within that time.
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