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Predisposing factors in the formation of true knots of the umbilical cord‐analysis of morphometric and perinatal data
Author(s) -
Blickstein I.,
ShohamSchwartz Z.,
Lancet M.
Publication year - 1987
Publication title -
international journal of gynecology and obstetrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.895
H-Index - 97
eISSN - 1879-3479
pISSN - 0020-7292
DOI - 10.1016/0020-7292(87)90346-8
Subject(s) - umbilical cord , knot (papermaking) , fetus , fetal distress , cord , fetal weight , medicine , anatomy , obstetrics , biology , pregnancy , surgery , genetics , chemical engineering , engineering
Fifty‐four umbilical cords with a true knot were analysed and compared to 108 normal cords. True knots were found in 1.22% of births. They occurred at a significantly higher rate in longer cords (P < 0.00001), in male fetuses (P < 0.05) and in multiparous women (P < 0.003). Signs of fetal distress were observed more frequently in female fetuses, especially in those with longer cords. A true knot seems to disrupt the significant correlation (P < 0.007) between cord length and birth weight that we observed in controls. The present study reviews the literature on the subject and suggests a possible mechanism for true knot formation.