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KMID : 0438219750120010357
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Korea University Medical Journal
1975 Volume.12 No. 1 p.357 ~ p.363
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The Clinical and Statistical Study on Friedman Curve
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Abstract
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There are many factors which influence the duration of first and second stages of labor, such as uterine contraction, frequency and intensity of labor pains, cervical resistance, consistency of cervix, and abnormal presentation.
Friedman had devised a new method that´ helps to evaluate the course of labor statistically in 1954, and had obtained the sigmoid nature of the normal cervical dilatation-time curve.
The author had studied 566 deliveries excluding those mothers that had delivered abdominally and in emergency, who had come early enough to make evaluation of the labor progress possible, at the Department of Obstetrics & Gynecology, Korea University, Medical College, Woo-Sok Hospital in 1973, and obtained results as followings:
1. The labor progress curve observed in 566 cases showed similar type that of Friedman´s as a sigmoid shape. The curve in multipara group appeared to be shorter in every phases than that of primipara group.
2. There showed no significant differences in the duration of labor between the breech and the vertex presentations.
3. The duration of labors in twin pregnancies was shorter than those of singletons.
4. The severe preeclampsia group showed shorter duration of labor compared it to the control group.
5. The duration of labor was delayed in primipara group whose each infant´s birth weight was more than 4kg, while there showed no significant delay in multipara group.
6. In premature rupture of membrane group, the duration of labor was shortened compared it to the control group.
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