患者女,31岁,以“孕38+3周孕3产1头位临产,巨大儿”于凌晨2:30急诊入院。产科检查:腹围38cm,子宫底110cm,胎位:LOA,胎心138次/min,先露部半固定,骨盆内外测量均正常范围。胎儿大小估计4500g,阴道检查先露S-1,2:30,宫口情况:3cm。入院后于4:30宫口开全,考虑胎儿过大,行会阴侧切 Female patient, 31 years old, with “pregnant 38 +3 weeks pregnant 3 producing 1 head of labor, huge children” at 2:30 in the morning emergency admission. Obstetric examination: abdominal circumference 38cm, 110cm at the end of the uterus, fetal position: LOA, fetal heart rate 138 times / min, the first dew and semi-fixed, both within and outside the pelvis measured normal range. Fetal size estimated 4500g, vaginal examination revealed S-1,2: 30, cervix conditions: 3cm. After admission, open at 4:30 Palace, consider the fetus is too large, the guild of vulva lateral cut