What is the most common cause of variable decelerations in fetal heart rate?
Uteroplacental insufficiency
Umbilical cord compression
Maternal hypotension
Fetal head compression
The Correct Answer is B
The correct answer is choice B. Umbilical cord compression. Variable decelerations are the most common type of fetal deceleration and they are caused by compression of the umbilical cord. They vary in shape, duration, and intensity and may not have a constant relationship with uterine contractions.
Choice A is wrong because uteroplacental insufficiency is the cause of late decelerations, not variable decelerations. Uteroplacental insufficiency is a decrease in the blood flow to the placenta that reduces the amount of oxygen and nutrients transferred to the fetus.
Choice C is wrong because maternal hypotension is one of the possible causes of late decelerations, not variable decelerations. Maternal hypotension can reduce the uteroplacental blood flow and cause fetal hypoxia.
Choice D is wrong because fetal head compression is the cause of early decelerations, not variable decelerations. Early decelerations are benign and uniform in shape and they occur when the fetal head is pressed against the cervix during a uterine contraction.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
The correct answer is choice D. A patient who is 34 weeks pregnant with a breech presentation and ruptured membranes.This is because breech presentation and ruptured membranes are both risk factors for umbilical cord prolapse, which is where the umbilical cord descends through the cervix and is alongside or below the presenting part of the fetus.This can cause fetal hypoxia and distress.
Choice A is wrong because a cephalic presentation and intact membranes are not risk factors for umbilical cord prolapse.
Choice B is wrong because although twins and ruptured membranes are risk factors for umbilical cord prolapse, the risk is lower than in choice D. Choice C is wrong because although a transverse lie is a risk factor for umbilical cord prolapse, the risk is lower than in choice D if the membranes are intact.
Correct Answer is A
Explanation
The correct answer is choice A. Normal involution.
This means that the uterus is returning to its pre-pregnancy size and position after delivery.
The fundus is the upper part of the uterus and it should be firm, midline, and gradually descend into the pelvis.A fundus that is 2 cm below the umbilicus at 4 hours postpartum is within the normal range.
Choice B. Subinvolution is wrong because it refers to a delayed or incomplete involution of the uterus.
This can result in prolonged bleeding, infection, or retained placental fragments.A fundus that is above the umbilicus, boggy, or displaced to one side may indicate subinvolution.
Choice C. Retained placenta is wrong because it means that some or all of the placenta remains in the uterus after delivery.
This can cause heavy bleeding, infection, or uterine atony.A fundus that is high, soft, or tender may indicate retained placenta.
Choice D. Endometritis is wrong because it means that the lining of the uterus is inflamed due to infection.
This can cause fever, foul-smelling lochia, pelvic pain, or uterine tenderness.A fundus that is enlarged, tender, or malodorous may indicate endometritis.
Normal ranges for fundal height after delivery are:
• Immediately after delivery:
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