扬州大学：《妇产科学》课程教学课件（PPT讲稿）23 正常分娩 Normal Labor and Delivery

Normal Labor and Delivery正常分娩

Normal Labor and Delivery 正常分娩

Labor:the process by which contractions of uterusexpelthefetus.Deliveryreceivetheneonate

◼ Labor : the process by which contractions of uterus expel the fetus. ◼ Delivery : receive the neonate

1. definitionTerm pregnancy: 37-42weeks from LMPpre-term delivery (labor): 28- <37 weeks ofgestational agepost-term delivery:≥ 42 weeksAbortion:<28week85% of women spontaneous labor anddelivery between 37-42 weeks

1. definition ◼ Term pregnancy: 37-42weeks from LMP ◼ pre-term delivery (labor): 28- <37 weeks of gestational age ◼ post-term delivery: 42 weeks ◼ Abortion : <28 week ◼ 85% of women spontaneous labor and delivery between 37-42 weeks

2. The four factors for laborForce (uterine contraction)birth canal (bony canal)fetus (lie,position ,presentation,weight)psychical-factors

2. The four factors for labor ◼ Force ( uterine contraction) ◼ birth canal (bony canal) ◼ fetus (lie,position ,presentation,weight) ◼ psychical-factors

Contractionsonset, frequency, duration, intensityincrease in frequency and durationuterus can be felt to harden duringcontractionlasting about30-45 secondsinterval between contractions to be 5 minIntensity (slight, middle, heavy)the pain of labor is a character

Contractions onset, frequency, duration, intensity ◼ increase in frequency and duration ◼ uterus can be felt to harden during contraction ◼ lasting about 30-45 seconds ◼ interval between contractions to be 5 min’ ◼ Intensity (slight, middle, heavy) ◼ the pain of labor is a character

正常曲线异常曲线15:1020NO10

正常曲线 异常曲线

Birthcanal;Bony canalSoft tissue canal (lower part of uterus, cervix,vagina

◼ Birth canal; Bony canal Soft tissue canal (lower part of uterus, cervix, vagina

Bony pelvisTheplanesof pelvisinletplane (promontory)midplaneof pelvis(ischia spines)outletplane(two intersectingtriangles)

Bony pelvis ◼ The planes of pelvis ◼ inlet plane (promontory) ◼ mid plane of pelvis (ischia spines) ◼ outlet plane(two intersecting triangles) ◼

EarlyeffacementBefore labor30%0%effacement3CompleteComplete effacementdilation100%