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6.Normal Labor,Delivery And The Puerperium
1. Normal Labor ,Delivery and the Puerperium Department of Obstetrics and Gynecology , The general hospital of Tian Jin medical university Zhang Xuhong
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4. An important ancillary force in expulsion of the fetus is that produced by increased maternal intra-abdominal pressure.
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11. Psychological factors :recent research has shown that it act an important role in labor.because of fearing labor pain,a considerable number of women suffered dystocia.
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20. Third stage : is from the birth of the baby to the delivery of placenta and membrances .
21. Length of stages 5~15min 5~15min Duration of third stage 5~30min 1~2hours Duration of second stage 1.5cm/hour 1.2cm/hour Rate of cervical dilatation during active phase 6~8 hours 11~12 hours Duration of the first stage multipara primipara