Maternal smoking during pregnancy and placental abruption risk in Northwest Russia; a MCBR study

Background Placental abruption is a pregnancy complication that leads to separation of placental lining from the uterus before delivery. Two-thirds of placental abruptions are accompanied by fetal or neonatal complications, which includes preterm delivery. International studies show that maternal smoking increases the risk of placenta abruption, but the evidence from Russia is …