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正常分娩(英文)
Definitions Labor is the process by which
contractions of the gravid uterus expel the fetus
and the other products of conception after 28
weeks from the last menstrual period
Term Delivery A term delivery occurs
between 37 and 42 weeks from the last menstrual
period.
Premature labor. Preterm labor is that
occurring before 37 weeks of gestational age.
Postdate pregnancy Postdate pregnancy
occurs after 42 weeks
The etiology of labor
Not sure
1, Cervix ripend and lower uterine segment development theory;
2, Endocrine regulating theory
3、 Mechanical theory
4、 Neurohumor theory
5、 Immunologic theory
Maturation of fetus and change of uterus function is necessary.
Four Determinate Factors of labor
The progress and final outcome
of
labor are
influenced by 4 factors
(I)the powers
(2)the passage
()the passenger
(4)the psyche
The expulsive forces(The powers)
The power that expulse the fetus
and the other products of
conception is called the expulsive
forces, which include
♀ uterine contraction
9 intra-abdominal pressure
9 levator ani muscles contractions
6
Uterine contractions
Have three unique characteristics:
*Rhythm: increase in frequency and duration, is the
important marker of in laboro
* Symmetry and polarity
★ Retraction
Rhythm
Increase in frequency and duration
Periods of relaxation between contractions are essential to the welfare
of the fetus
Characteristic of normal uterine action
intramuscular pressure
(mmHg)
Intersity of the contraction
T
⊥Pain
x Symmetry and Polarity
The intensity of the upper segment
of the uterus is the most strong
子宫收缩力的对称性
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