The main symptoms were scar uterus,abnormal fetal position,cephalopelvic disproprotion(CPD),premature dilivery and pregnancy induced hypertension syndrome(PIH),etc.

• 高危妊娠的病因构成依人口不同而有别,主要是疤痕子宫、胎位异常、头盆不称、早产、妊高征等等。