Umbilical cord prolapse
Umbilical cord prolapse is a rare complication characterized by an umbilical cord descending through the cervix prior to the presenting fetal part, and may lead to fetal distress if the fetus compresses the cord as it subsequently traverses the birth canal. Incidence of prolapsed unbiblical cord has been variously reported but is generally felt to occur in approximately 0.5–1% of all deliveries [4–6]. Although no specific data have been offered on the incidence of prolapsed umbilical cords encountered in the prehospital environment, it is reasonable to expect a rate generally similar to overall incidence.
Risk factors for prolapsed cord include abnormal presentation of the fetus (particularly breech), lack of prenatal care, twinning (particularly the second-born twin), and gestational diabetes/macrosomia [4,5]. The presence of a prolapsed cord is associated with lower Apgar scores and increased perinatal mortality, and it is imperative that the prehospital provider assesses for this potentially disastrous condition by visualizing the perineum. For crews with advanced fetal monitoring capability, unexplained fetal distress should prompt sterile vaginal exam to assess for the presence of this complication [5,7,8].
Emergency treatment of umbilical cord prolapse centers on the temporizing decompression of cord by elevation of the presenting fetal part followed by rapid delivery to remove the neonatal dependence on umbilical cord blood flow for oxygenation. Using a gloved hand, the provider gently elevates the presenting part. The exposed cord may be covered in a moist sterile towel. If Doppler is not available to assess cord blood flow, an attempt may be made detect pulsation in the cord; however, this may be faint and care must be taken to avoid further manual compression of the cord during palpation [7,8]. Because prolapsed cord is associated with abnormal presentations, rapid completion of delivery, particularly in the prehospital setting, may be less likely. Providers should expedite transport if at all possible in these situations while attempting to preserve cord blood flow via manual elevation of the presenting part as described above and positioning of the mother in the knee-to-chest position or steep Trendelenburg to aid in reducing pressure on the cord [8]. Most often, cesarean section is undertaken to expedite delivery once at the hospital [4,5,8].