Search on website
chevron-left-black Keywords

FHT: Variable decelerations

Variable decelerations are the most common type of decelerations and are transient decreases in fetal heart rate that characteristically vary in duration, shape/magnitude, and timing/onset. They correspond with uterine contractions and are likely a result of umbilical cord compression against the fetus leading to decreased umbilical blood flow. They can be classified as mild (lasting <30 sec and FHR remains >80 bpm), moderate (FHR <80 bpm), or severe (lasting longer than 60 sec and FHR <70 bpm). Variable decelerations can lead to fetal asphyxia when severe or may progress to late decelerations or severe fetal bradycardia, both of which indicate the need for urgent intervention.

Other References

  1. Keys to the Cart: September 4, 2017; A 5-minute video review of ABA Keywords Link