子宫下段剖宫产术延长子宫下段横切口的方法,有钝性(术者用食指向两侧牵拉延长)和锐性(用剪刀延长)。术者仅凭经验或理论上认为可能会对减少切口延裂、出血量及子宫壁损伤有好处而选择方法。支持锐性扩展者认为易控制切口的长度及方向,可减少切口延裂及损伤血管并减少出血,而钝性扩展则增加延裂易损伤血管,肌纤维在子宫切口末端堆积增加了子宫壁囊状损伤的可能性,使再次分娩异常而再行剖宫产术。支持钝性扩展者则认为可保护子宫血管减少出血。作者通过比较切口延裂对两种方法进行了前瞻性研究。 Lower uterine cesarean section to extend the lower uterine transverse incision approach, there are blunt (surgeon with the index finger extended to both sides of the stretch) and sharp (with scissors extension). The surgeon, based on experience or theory alone, may choose ways to reduce the risk of nick incisions, bleeding, and uterine wall damage. Support the sharp expander that the easy to control the length and direction of the incision, can reduce the incision rupture and damage to the blood vessels and reduce bleeding, and dull expansion of the fragility of the seizure is easy to damage blood vessels, fiber accumulation in the end of the uterine incision increased uterine wall sac The possibility of injury, so that abnormal delivery again cesarean section. Those who support blunt extension are considered to protect the uterine blood vessels to reduce bleeding. The authors prospectively compared the two methods by comparing the incision delay.