What is the most likely cause for variable fetal heart rate (FHR) decelerations?
Fetal hypoxemia.
Altered fetal cerebral blood flow.
Uteroplacental insufficiency.
Umbilical cord compression.
The Correct Answer is D
Choice A rationale
Fetal hypoxemia, a deficiency in oxygen reaching the fetal tissues, typically manifests as late decelerations in the fetal heart rate tracing, which reflect uteroplacental insufficiency. While severe hypoxemia can lead to various FHR patterns, variable decelerations are more directly associated with mechanical factors affecting the umbilical cord.
Choice B rationale
Altered fetal cerebral blood flow can be a consequence of various factors, including hypoxemia and cord compression, and can influence the fetal heart rate. However, variable decelerations are specifically caused by events that directly impede blood flow through the umbilical vessels rather than a generalized alteration in cerebral circulation.
Choice C rationale
Uteroplacental insufficiency, a condition where the placenta is unable to deliver an adequate supply of oxygen and nutrients to the fetus, typically results in late decelerations, indicating fetal distress due to chronic hypoxia. Variable decelerations, in contrast, have a more abrupt onset and recovery, reflecting acute changes in umbilical cord blood flow.
Choice D rationale
Umbilical cord compression occurs when the umbilical cord, which carries oxygen and nutrients to the fetus, is squeezed or constricted. This compression leads to a transient decrease in fetal blood flow and oxygenation, resulting in a rapid drop and subsequent return of the fetal heart rate, which is characteristic of variable decelerations. The shape, timing, and abrupt nature of variable decelerations directly correlate with the intermittent pressure on the umbilical cord.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale
Misoprostol is a prostaglandin analog that stimulates uterine contractions. It is contraindicated in clients with placenta previa due to the risk of severe hemorrhage from placental separation if contractions are induced.
Choice B rationale
Active genital herpes is a contraindication for vaginal delivery and therefore also a contraindication for induction of labor with Misoprostol, as it could potentially lead to vertical transmission of the herpes simplex virus to the newborn during passage through the birth canal.
Choice C rationale
A previous uterine incision due to multiple myomectomy can be a contraindication for labor induction with Misoprostol, depending on the type and location of the incisions. The increased risk of uterine rupture with strong contractions stimulated by Misoprostol is a significant concern in such cases.
Choice D rationale
Gestational hypertension, in the absence of other contraindications, can be an indication for induction of labor if the benefits of delivering the baby outweigh the risks of continuing the pregnancy. Misoprostol can be used cautiously in this situation to ripen the cervix and induce labor.
Correct Answer is C
Explanation
Choice A rationale
Limiting the newborn's intake of milk is contraindicated in the treatment of hyperbilirubinemia. Adequate hydration and frequent feedings are essential to promote bilirubin excretion through stool and urine. Decreased intake can exacerbate dehydration and worsen jaundice. Normal feeding frequency for newborns is typically every 2-3 hours.
Choice B rationale
Feeding the newborn every six hours is not an appropriate intervention for a jaundiced infant receiving phototherapy. Frequent feedings, typically every 2-3 hours, are necessary to promote bilirubin excretion. Prolonged intervals between feedings can lead to dehydration and hinder the effectiveness of phototherapy.
Choice C rationale
Turning the infant every two hours is a crucial nursing intervention during phototherapy. This ensures that all body surfaces are exposed to the ultraviolet light, maximizing the breakdown of bilirubin in the skin. Consistent exposure of all areas helps to lower bilirubin levels more effectively.
Choice D rationale
Applying an oil-based lotion to the newborn's skin during phototherapy is contraindicated. Oil-based lotions can create a barrier on the skin, reducing the penetration and effectiveness of the ultraviolet light. Only water-based lotions, if necessary, should be used sparingly and with caution, as some may absorb UV light.
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