[Biomechanical properties of human umbilical vessels at different gestational ages and their clinical significance].
To provide theoretical data on biomechanical properties for the clinical application of human umbilical artery and umbilical vein. The calculation of the compliance of fetal umbilical artery and umbilical vein was made on the basis of measuring the pressure-volume relationship of the umbilical artery and umbilical vein collected from 50 normal fetuses and newborns of abortion and normal labor whose gestational ages ranged from 24 weeks to 42 weeks. It was found that the P-V relationship of umbilical artery and umbilical vein corresponded to parabolic curve and the compliance increased gradually with the growth of the gestational age, but when the gestational age was beyond 39 weeks the compliance began to decrease gradually. The compliance of umbilical vein is twice or triple as large as that of umbilical artery. Human umbilical artery and umbilical vein are good substitute materials for arterial grafts. In transplantation, two factors should be considered, first, the correspondence between the compliance of umbilical vessels and that of host artery; second, the relationship between the compliance and gestational age. We suggest that it be better to use selectively the umbilical artery and umbilical vein with a gestational age from 37 weeks to 40 weeks as the transplanting material.
Li
W
W
Department of Anatomy, Yunyang Medical College, Shiyan 442000.
Huang
T
T
Zeng
F
F
Zhou
L
L
D001696:Biomechanical Phenomena; D005260:Female; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D014469:Umbilical Arteries / Q000502:physiology* / Q000637:transplantation; D014471:Umbilical Veins / Q000502:physiology* / Q000637:transplantation