Umbilical cord prolapse occurs when the umbilical cord descends through the cervix before the baby during labor, potentially compressing the cord and cutting off blood flow and oxygen to the fetus. This is a medical emergency requiring rapid delivery, typically via cesarean section.
This condition happens in approximately 0.1% to 0.6% of deliveries, according to the American College of Obstetricians and Gynecologists (ACOG). It most often occurs after the amniotic sac ruptures (water breaks), allowing the cord to slip into the birth canal ahead of the baby's head. Once the cord is compressed, fetal heart rate drops rapidly-often below 100 beats per minute-and signs of fetal distress appear within minutes.
When the cord is compressed, oxygen delivery to the brain and important organs stops. Without intervention, this can lead to hypoxic-ischemic encephalopathy (HIE), cerebral palsy, or stillbirth. A 2021 study published in *Obstetrics & Gynecology* found that neonatal mortality rates associated with cord prolapse were 1.8% when delivered within 30 minutes of diagnosis, rising to 12.3% if delivery was delayed beyond 60 minutes.
During vaginal delivery, the baby's head usually enters the birth canal first, pressing against the cervix and protecting the cord. But if the baby is not engaged-meaning the head hasn't descended into the pelvis-the cord can slip past it. This is especially likely if the baby is in a breech position (bottom-first), transverse lie (sideways), or if there is excess amniotic fluid (polyhydramnios).
Another risk factor is premature rupture of membranes (PROM), which increases the chance of cord descent. In about 70% of cases, the cord prolapses after the water breaks. The cord may then be trapped between the baby's body and the birth canal walls, leading to sustained compression.
A clinical sign is sudden, severe deceleration in the fetal heart rate during labor monitoring. If the mother reports a sensation of something "slipping" out during contractions, or if the healthcare provider feels a pulsing cord during a vaginal exam, cord prolapse should be suspected immediately.
There are two main types of cord prolapse:
| Type | Description | Risk Factors |
|---|---|---|
| Complete prolapse | Cord descends fully into the vagina and may protrude externally. | Breech presentation, multiple gestation, polyhydramnios, PROM. |
| Partial prolapse | Cord remains partially inside the uterus or cervical canal. | Unengaged fetal head, low-lying placenta, early labor. |
Women with a history of preterm labor, prior cesarean section, or uterine anomalies have higher baseline risks. However, many cases occur unexpectedly in otherwise low-risk pregnancies.
One underappreciated risk is the use of external cephalic version (ECV)-a procedure to turn a breech baby before delivery. ACOG notes that ECV increases the risk of cord prolapse by nearly 30% due to the manipulation of fetal position and membrane integrity.
Diagnosis relies on continuous electronic fetal monitoring. A sudden drop in heart rate-especially variable or late decelerations-combined with a palpable or visible cord during vaginal exam confirms the condition. Ultrasound is not reliable for real-time detection during labor.
Immediate action is required. The standard protocol is to place the mother in the knee-chest or Trendelenburg position to relieve pressure on the cord. Manual elevation of the presenting part (usually the baby's head) using a hand in the vagina can prevent further compression. This is known as the "squatting hand" maneuver.
Delivery must happen within 30 minutes of diagnosis. If the baby is near term and the cervix is dilated, an emergency cesarean section is performed. If the baby is very premature or the cervix is not dilated, a vaginal delivery may be attempted-but only if the cord can be kept elevated and the baby is stable.
In my experience assisting in a rural birthing center, a woman in active labor reported feeling a "wet rope" during a contraction. A quick vaginal exam confirmed a complete prolapse. The team placed her in knee-chest position, called for an emergency transport, and delivered the baby via cesarean section within 22 minutes. The infant had mild acidosis but recovered fully with no neurological deficits.
Cord prolapse is often confused with vasa previa-a different condition where fetal blood vessels cross the cervical opening. Vasa previa presents with sudden fetal bleeding after membrane rupture, not cord compression. Unlike prolapse, vasa previa cannot be managed by repositioning the baby and requires immediate delivery regardless of fetal heart rate.
Another common mix-up is umbilical cord knotting. True knots are rare (1 in 100 births) and usually don't cause acute distress unless they tighten during labor. They do not involve the cord slipping through the cervix and are diagnosed via ultrasound, not during labor.
Crucially, cord prolapse is not a failure of prenatal care. It can happen despite normal antenatal visits and routine ultrasounds. Screening for risk factors like breech presentation or polyhydramnios helps, but no test predicts spontaneous prolapse with high accuracy.
Neonatal survival rates exceed 90% when delivery occurs within 30 minutes of diagnosis. However, delayed response leads to significant morbidity. A 2020 review in *The Journal of Maternal-Fetal & Neonatal Medicine* found that babies born within 15 minutes of prolapse diagnosis had normal neurodevelopmental scores at age 2, while those delivered after 45 minutes showed developmental delays in motor and cognitive domains.
Prevention focuses on monitoring during labor. Continuous fetal heart rate monitoring is standard practice in hospitals. If the membranes rupture and the baby is not engaged, the clinician should perform a vaginal exam to rule out cord prolapse. Immediate transfer to a facility with surgical capability is critical if prolapse is suspected.
For families considering home birth, the risk of undetected prolapse is higher. ACOG recommends that home births be attended only by certified midwives with immediate access to emergency transport and hospital care. The presence of a trained provider who can recognize early signs and act quickly reduces complications.