True knot of the umbilical cord

Ira J. Chasnoff, Mary Ann Fletcher

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


Fifty umbilical cords were prepared and examined and their venous perfusion pressures measured with and without a true knot in the cord. Contrary to information in the literature, a loose umbilical cord knot did not affect the venous perfusion pressure. With a tightened knot, the smaller the umbilical cord diameter, the greater was the pressure required to perfuse past the knot. The umbilical vessels, protected by the myxomatous structure of the Wharton's jelly, were rarely completely occluded. These findings correlate clinically with the relatively high incidence yet low fetal mortality rate actually due to a true knot in the umbilical cord.

Original languageEnglish (US)
Pages (from-to)425-427
Number of pages3
JournalAmerican journal of obstetrics and gynecology
Issue number4
StatePublished - Feb 15 1977
Externally publishedYes

ASJC Scopus subject areas

  • Obstetrics and Gynecology


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