@usm.my
LECTURER, DEPARTMENT OF OBSTETRICS & GYNAECOLOGY, SCHOOL OF MEDICAL SCIENCES
UNIVERSITI SAINS MALAYSIA
Nuchal cord occurs when the umbilical cord becomes wrapped around the fetal neck 360 degrees. Nuchal cord occur in about 10–29% of fetuses, and the incidence increases with advancing gestation age. Most are not associated with perinatal morbidity and mortality. Still, a few studies have shown that nuchal cord can affect the outcome of delivery with possible long-term effects on the infants. Nuchal cord more likely to cause problems when the cord is tightly wrapped around the neck, with results of a tight nuchal cord conceptually similar to strangulation. Umbilical cord compression due to tight nuchal cord may cause obstruction of blood flow in thin-walled umbilical vein, while infant’s blood continues to be pumped out of the baby through the thicker-walled umbilical arteries causing hypovolemia, acidosis and anaemia. Some of these infants have physical features secondary to tight nuchal cords that are distinct from those seen with birth asphyxia. The purpose of this article is to review the pathophysiology of tight nuchal cord and explore gaps in knowledge and research areas.
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