The image characteristics of cervical pregnancy included absence of the gestational sac in the uterine cavity closed cervical internal os irregular gestational sac or diffuse amorphous echoes in the cervical canal with extensive colour blood flow .

子宫颈妊娠图像特征： 宫腔内未见妊娠囊， 子宫颈内口关闭，子宫颈 管内见不规则妊娠囊或回声紊乱区，彩色血流信号丰富。

Results : The primary reason of postpartum hemorrhage was the weakness of uterine contraction in 209 cases . The placenta factor and laceration of birth canal was the second cause .

结果：产后出血的首位原因是 子宫收缩乏力（209例），其次是胎盘因素及软 产道裂伤。

Results : The main causes of postpartum hemorrhage were as follows : uterine inertia placenta factor some birth canal injury coagulation functional disturbance and so on .

结果：产后出血原因： 宫缩乏力、胎盘因素、软 产道损伤、凝血功能障碍等。

Result : The main causes were uterine atony soft birth canal laceration retained placenta and membranes blood coagulation dysfunction etc.

结果：主要病因依次为 子宫收缩乏力、软 产道裂伤、胎盘胎膜残留、凝血功能障碍等。

The etiological factors of postpartum hemorrhage were uterine inertia ( 61.11 % ) the placenta factors ( 20 % ) soft obstetrical canal crack ( 11.11 % ) and coagulation disorders ( 7.78 % ) .

产后出血原因依次为： 子宫 收缩乏力（6111%）、胎盘因素（20%）、软 产道裂伤（1111%）、凝血功能障碍（778%）。

Results The rat of postpartum hemorrhage was 1.7 % . The rate of postpartum hemorrhage in postnatal 2 hours was 94.7 % . The reasons of postpartum hemorrhage are uterine atony injury of soft birth canal placental complication dysfunction of blood coagulating etc.

结果产后出血的发生率1.7%，产后2小时内出血者占94.7%，出血原因为 宫缩无力、软 产道损伤、胎盘因素、凝血功能障碍等。