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KMID : 0438219750120010333
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Korea University Medical Journal
1975 Volume.12 No. 1 p.333 ~ p.338
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Tensile Strength of the Umbilical Cord
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Abstract
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It is more than a century since Crede studied the mechanism of placental separation and expulsion, and suggested his method of management to reduce the high incidence of complications in 1853 Many modifications of the Crede method have been tried and found wanting during the intervening years, and many authorities believed that the method tends to cause shock and should not be used often. The cord traction should be gentle and steady as M. L. Brandt - has described in 1933. The `Brandt-Andrews´ maneuver has been replaced by that of the ´controlled cord traction´ by colleges in which the traction was gentle at first and then, was slowly increased making placental delivery quite easy.
It was therefore decided to investigate the umbilical cord further to determine more precisely its tensile strength, and to attempt to discover if there was any relationship between the strength and other associated factors. One hundred cords were examined from term spontaneous vertex deliveries . at College of Medicine, Korea University and the following results were obtained;
1. The duration of third stage of labor among 100 cases were;
within 5 minutes: 23(23%)
within 10 minutes: 69(69%)
within 15minutes: 91(91%)
2. The average birth weight of 100 cases was 3.23 kg and the average placental weight was 697. 08 gm with 55.45 cm as the average umbilical cord length.
3. The average load required to rupture the cord was 4.55 kg with a variability between 1.06 and 8.5 kg.
4 No useful relationship was found between the cord strength and the weight of its placenta or
the infant, and also, there was no relationship between the tensile strength and its length or the site of rupture. No relationship was found between the length of the cord and the weight of the placenta or of the infant. A direct relationship between the weight of an infant and the placenta was not found to be as absolute as was previously thought.
5. 12(12%) cords ruptured at their placental insertion and 70(70%) cords ruptured within 20em from the insertion.
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