妇产科学-- Normal Labor.pptVIP

The Normal Labor The Normal Labor delivery：is the mode of actual expulsion of the fetus and placenta after 28 weeks of gestation. Premature delivery ：?28w，37w Term delivery：?37w，42w Postterm delivery：?42w The normal labor Mechanism of initiation of labor the functionality changes of uterus the endocrine regulation after fetal mature The normal labor Mechanism of initiation of labor Mechanical theroy Endocrine control theroy Neurohumor theroy The normal labor Enssential factors of labor 一.The powers (一) myometrial contractions 1. rhythmicity 2. symmetry 3. polarity 4.retraction The normal labor Enssential factors of labor 一.The powers (二) the contraction fource of abdominal muscle and diaphragmatic muscle (三) the contraction fource of levator ani muscle The normal labor Enssential factors of labor 二.The passage Bony pelvis Soft birth canal 1. the formation of Lower uterine segment 2.the changes of cervix effacement: cervical effacement cervical delatation 3.the changes of pelvic floor,vagina and perineum The normal labor Enssential factors of labor 三.The passager (一)fetal size (二) fetal position (三) fetal anomaly 四.The psyche The normal labor Mechanisms of labor : vertex presentation. Mechanisms of labor : delivery proceeds along the “line of least resistance “,ie,by adaptation of the smallest achievable diamaters of the presenting part to the most favorable dimensions and contours of the birth canal. The normal labor The diagnosis of threatened labor and in labor (一) threatened labor 1.false labor 2. lightening 3. show (二) The diagnosis of in labor in labor: uterine constractions is regular and increase gradually