A nurse is assisting in the care of a client who is in active labor. The nurse notes variable decelerations of the FHR. The nurse should identify which of the following as a cause of variable decelerations?

Choice B reason:
Uterine atony is the failure of the uterus to contract and retract after delivery, which can lead to excessive bleeding and hemorrhage. The client is at risk for uterine atony due to delivering a large newborn, which can overstretch the uterine muscles and reduce their tone.

Choice A reason:
Puerperal infection is an infection of the reproductive tract that occurs within six weeks after delivery. The client is not at increased risk for puerperal infection due to delivering a large newborn, unless there are other factors such as prolonged labor, multiple vaginal exams, or episiotomy.

Choice C reason:
Thrombophlebitis is an inflammation of a vein with a blood clot formation. The client is not at increased risk for thrombophlebitis due to delivering a large newborn, unless there are other factors such as immobility, dehydration, or trauma.

Choice D reason:
Retained placental fragments are pieces of the placenta that remain in the uterus after delivery, which can cause bleeding and infection. The client is not at increased risk for retained placental fragments due to delivering a large newborn, unless there are other factors such as abnormal placental atachment, manual removal, or incomplete separation.

Choice A reason:

Maternal opioid administration is incorrect, as this factor can cause late decelerations in the fetal heart rate. Late decelerations are symmetrical decreases in the FHR that begin after the peak of the contraction and return to baseline after the contraction ends, which indicate uteroplacental insufficiency. Maternal opioid administration can reduce maternal blood pressure and placental perfusion, leading to fetal hypoxia.

Choice B reason:
Fetal head compression is incorrect, as this factor can cause early decelerations in the fetal heart rate. Early decelerations are symmetrical decreases in the FHR that mirror the contractions, which indicate fetal head compression and vagal stimulation. Fetal head compression occurs as the fetus descends into the birth canal and does not pose a threat to the fetal well-being.

Choice C reason:
Uteroplacental insufficiency is incorrect, as this factor can cause late decelerations in the fetal heart rate. Uteroplacental insufficiency refers to a reduced blood flow and oxygen delivery to the fetus through the placenta, which can result from maternal hypotension, uterine hyperstimulation, placental abruption, or other conditions. Uteroplacental insufficiency can cause fetal hypoxia and acidosis.

Choice D reason:
Umbilical cord compression is correct, as this factor can cause variable decelerations in the fetal heart rate. Variable decelerations are abrupt decreases in the FHR that vary in onset, duration, and depth, which indicate umbilical cord compression and reduced blood flow to the fetus. Umbilical cord compression can occur due to cord prolapse, nuchal cord, short cord, or other causes. The nurse should reposition the client, administer oxygen, and prepare for delivery if indicated.