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Cervical dilation may be induced mechanically by placing devices inside the cervix that will expand while in place. A balloon catheter may be used. Other products include osmotic dilators , such as laminaria stick (made of dried seaweed) or synthetic hygroscopic materials, which expand when placed in a moist environment.
A ripe cervix is favorable prior to induction of labor, which is a common obstetric practice, and increases the chances for a successful induction. [24] Pharmacological methods are sometimes required to induce cervical ripening that does not occur naturally. [25]
The American Congress of Obstetricians and Gynecologists has recommended against elective induction before 39 weeks if there is no medical indication and the cervix is unfavorable. [14] One recent study indicates that labor induction at term (41 weeks) or post-term reduces the rate of caesarean section by 12%, and also reduces fetal death. [ 15 ]
Histologically, the cervix undergoes significant changes towards the end of gestation, allowing the ripening of cervix for the passage of birth delivery. First, there is an increase in the cervical synthesis of glycosaminoglycan hyaluronan (HA), which increases tissue hydration, thereby catalyzing the degradation of collagen and elastin-fibers.
Dilation (or dilatation) and curettage (D&C) refers to the dilation (widening or opening) of the cervix and surgical removal of sections and/or layers of the lining of the uterus and or contents of the uterus such as an unwanted fetus (early abortion before 13 weeks), remains of a non-viable fetus, retained placenta after birth or abortion as well as any abnormal tissue which may be in the ...
Cervical ripening is the physical and chemical changes in the cervix to prepare it for the stretching that will take place as the fetus moves out of the uterus and into the birth canal. A scoring system called a Bishop score can be used to judge the degree of cervical ripening to predict the timing of labour and delivery of the infant or for ...
Rankins says cervical insufficiency happens when there's painless dilation, or opening, of the cervix, typically in the second trimester of pregnancy, or during weeks 13 through 28.
Effacement translates to how 'thin' the cervix is. The cervix is normally approximately three centimetres long, as it prepares for labour and labour continues the cervix will efface until it is 'fully effaced' (paper-thin). Cervical dilation: Closed 1–2 cm 3–4 cm 5+cm Dilation is a measure of how open the cervical os is.