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LENGTH OF GESTATIOON

A normal gestation lasts 40 weeks after the first day of the most recent menstrual period, and term gestation is defined at 37 to 42 weeks. In the united states, only 7 percent of pregnancies will extend beyond 42 weeks.17 In an uncomplicated pregnancy, there is no fetal or maternal benefit to induction before 41 weeks' gestation.17

Labor

labor is defined as the onset of regular contractions and cervical change. It is traditionally divided into three stages. The first stage encompasses the onset of labor to the complete dilatation of the cervix, and is subdivided into latent and active phases. The active phase begins when the rate of cervical dilatation accelerates, which occurs at 4 cm on average. The second stage consists of the time from complete dilatation of the cervix to delivery of the infant. The third stage is complete at the delivery of the placenta. The original labor curves were plotted by Friedman in the 1950s and are the traditional basis for defining prolonged labor patterns.18 S subsequent studies included more patients receiving epidural analgesia and demonstrated a slower average progression of labor than seen in the Friedman curve.19-21 this suggests that more time should be allowed than previously recommended before intervening to hasten labor. Table 2 lists the range of average lengths and upper limits of normal for each stage of labor.18-21

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  • 1 decade ago
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    GESTATIOON 的長度

    正常的妊娠持續 40 周在最新的經期的第一天後,任期妊娠定義在 37 至 42 個星期。 美國州只有 7%的妊娠會超出一個簡單的妊娠 42 weeks.17,有 41 個星期 gestation.17 前感應沒有胎兒或孕產婦有利於勞動

    勞動的定義是性定期早搏及頸的變化。 傳統上它分為三個階段。 第一階段在發病的該的宮頸的完整擴張到勞動,並分為潛伏性和活動階段。 活躍的期開始時頸擴張的速率加速,平均發生在 4 釐米。 第二階段包括嬰兒的交付時間從子宮頸完整擴張。 第三階段已完成在傳遞的胎盤。 原始的勞動曲線在 1950 年代中,均形式繪製由弗裡德曼,傳統的基礎定義長時間的勞動 patterns.18 S 後續研究包括更多患者鎮痛及顯示一個較慢的平均進展的勞動比見於弗裡德曼 curve.19 21,這表明比以前來加快勞動建議前干預,應容許更多的時間。 表 2 列出了的平均長度範圍和正常的上限為每個階段 labor.18 21

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  • 1 decade ago

    正常懷孕持續40個星期在最近月经的第一天以后,並且期限懷孕被定義在37個到42個星期。 在美國,僅懷孕的7%在一次不複雜的懷孕的42 weeks.17之外將延伸,沒有胎兒或母親好處對歸納在41 weeks'之前; gestation.17

    勞方

    被定義作為規則收縮和子宮頸變動起始。 它傳統上被劃分成三個階段。 第一阶段包含勞方起始對子宮頸的完全膨脹和被細分入潛在和活躍階段。 活躍階段開始,當子宮頸膨脹的率加速,平均發生在4 cm。 第二阶段包括從子宮頸的完全膨脹的时间對嬰兒的交付。 第三级是完全的在胎盤的交付。 原始的辛苦曲線由20世紀50年代的弗裡德曼比被看見在弗裡德曼curve.19-21這建議密謀並且是為定義長時期的勞方patterns.18 S隨後研究的傳統依據包括接受硬膜外的痛覺缺失的更多患者並且展示了勞方一個更加缓慢的平均進步比以前建议使用應該允許更多时间在干預催促之前勞方。 表2列出平均長度和法線上限的範圍labor.18-21每個階段的

    勞方

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