Expired pregnancy

Where a pregnancy reaches or exceeds 42 weeks (= 294 days), it is termed an expired pregnancy. Its occurrence accounts for 5 to 10% of the number of births. The perinatal mortality rate is approximately 3 to 6 times that of full-term delivery. The intrauterine survival of an expired fetus depends mainly on the placental function. 1. The placenta functions normally and the fetus continues to grow. At birth, the fetal weight is too heavy or even due to calcification of the skull, which causes dystocia; 2. The placenta ages due to expiration. Function Insufficiency, placental blood flow and insufficient oxygen supply, the fetus no longer continues to grow and develop and is a "little old man" (hypermaturity syndrome). Hypoxic fetuses excrete meconium and amniotic fluid, fetal skin, amniotic membrane and umbilical cord. Low scores and high mortality. The risk of fetuses in primiparous pregnancy is higher than in those who have undergone pregnancy. Harm to the fetus and mother: fetal distress, reduced amniotic fluid, delivery difficulties and injuries.