A woman is being treated for preterm labor with magnesium sulfate. Which finding by the nurse indicates magnesium sulfate toxicity?
Select one:
Respiratory rate of 16.
Complaints by the client of feeling flushed and warm.
Fetal heart rate of 120.
Patellar reflexes are absent.
The Correct Answer is D
Choice A Reason: Respiratory rate of 16. This is an incorrect answer that indicates a normal finding that does not suggest magnesium sulfate toxicity. Respiratory rate is a measure of the number of breaths per minute, which reflects the respiratory function and oxygenation status. Respiratory rate of 16 is within the normal range for adults, which is 12 to 20 breaths per minute. Respiratory rate of 16 does not indicate magnesium sulfate toxicity, which can cause respiratory rate below 12 breaths per minute.
Choice B Reason: Complaints by the client of feeling flushed and warm. This is an incorrect answer that indicates a common side effect that does not indicate magnesium sulfate toxicity. Feeling flushed and warm are sensations that are caused by vasodilation (widening of blood vessels), which can occur as a result of magnesium sulfate administration. Feeling flushed and warm are not signs of magnesium sulfate toxicity, but rather expected and mild reactions that usually subside within a few hours.
Choice C Reason: Fetal heart rate of 120. This is an incorrect answer that indicates a normal finding that does not suggest magnesium sulfate toxicity. Fetal heart rate is a measure of the number of beats per minute of the fetal heart, which reflects the fetal well-being and oxygenation status. Fetal heart rate of 120 is within the normal range for fetuses, which is 110 to 160 beats per minute. Fetal heart rate of 120 does not indicate magnesium sulfate toxicity, which can cause fetal heart rate below 110 beats per minute or above 160 beats per minute.
Choice D Reason: Patellar reflexes are absent. This is because absent patellar reflexes are a sign of magnesium sulfate toxicity, which is a condition where the level of magnesium in the blood is too high, which can cause adverse effects on the neuromuscular and cardiovascular systems. Magnesium sulfate is a medication that is used to prevent or treat preterm labor, which is labor that occurs before 37 weeks of gestation. Magnesium sulfate works by relaxing the uterine muscles and inhibiting uterine contractions. However, magnesium sulfate can also affect other muscles and nerves in the body, and cause symptoms such as muscle weakness, respiratory depression, hypotension, or cardiac arrest.

Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A Reason: Vitamin K will increase erythropoiesis. This is an incorrect statement that confuses vitamin K with erythropoietin. Erythropoietin is a hormone that stimulates red blood cell production in the bone marrow. Vitamin K does not affect erythropoiesis.
Choice B Reason: Vitamin K will enhance bilirubin breakdown. This is an incorrect statement that confuses vitamin K with phototherapy. Phototherapy is a treatment that exposes the newborn's skin to light, which converts bilirubin into water-soluble forms that can be excreted by the liver and kidneys. Bilirubin is a yellow pigment that results from the breakdown of red blood cells. High levels of bilirubin can cause jaundice and brain damage in newborns. Vitamin K does not affect bilirubin metabolism.
Choice C Reason: Vitamin K will stop Rh sensitization. This is an incorrect statement that confuses vitamin K with Rh immune globulin. Rh immune globulin is an injection given to Rh-negative mothers who deliver Rh-positive babies, to prevent them from developing antibodies against Rh-positive blood cells in future pregnancies. Rh sensitization is a condition where the mother's immune system atacks the baby's blood cells, causing hemolytic disease of the newborn. Vitamin K does not affect Rh sensitization.
Choice D Reason: Vitamin K will promote blood clotting ability. This is a correct statement that explains the rationale for administering vitamin K as prophylaxis to newborns. Vitamin K is essential for the synthesis of clotting factors in the liver. Newborns have low levels of vitamin K at birth due to poor placental transfer and lack of intestinal bacteria that produce vitamin K. Therefore, they are at risk of bleeding disorders such as hemorrhagic disease of the newborn.

Correct Answer is C
Explanation
Choice A Reason: Enhance uterine contractions. This is an incorrect answer that contradicts the effect of narcotic analgesia on uterine activity. Narcotic analgesia can reduce uterine contractions by decreasing maternal catecholamine levels, which can prolong labor or increase bleeding.
Choice B Reason: Be used in place of preoperative sedation. This is an irrelevant answer that does not apply to this scenario. Preoperative sedation is a medication given before surgery to reduce anxiety, pain, or nausea. Narcotic analgesia can be used as a preoperative sedative, but it is not related to labor or delivery.
Choice C Reason: Result in neonatal respiratory depression. This is because narcotic analgesia can cross the placenta and affect the fetal central nervous system, which can cause decreased respiratory drive, apnea, bradycardia, or hypotonia in the newborn. The risk of neonatal respiratory depression is higher when narcotic analgesia is administered close to delivery, as there is less time for placental clearance or maternal metabolism.
Choice D Reason: Prevent the need for anesthesia with an episiotomy. This is an inaccurate answer that overestimates the effect of narcotic analgesia on perineal pain. Narcotic analgesia can provide some relief of labor pain, but it does not block pain sensation completely or locally. An episiotomy is a surgical incision made in the perineum to enlarge the vaginal opening during delivery, which requires local anesthesia or regional anesthesia (such as epidural or spinal). Narcotic analgesia does not prevent or replace anesthesia with an episiotomy.
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