A nurse is assisting with the care of a client who has severe preeclampsia and is receiving magnesium sulfate IV at 2 g/hr. Which of the following findings indicates that it is safe for the nurse to continue the infusion?
Respiratory rate of 16/min.
Heart rate of 60/min.
Urine output of 50 mL in 4 hr.
Diminished deep-tendon reflexes.
The Correct Answer is A
The correct answer is choice A: Respiratory rate of 16/min.
Choice A rationale:
A respiratory rate of 16/min is within the normal range for adults, which is typically between 12 to 20 breaths per minute. In the context of severe preeclampsia, maintaining a normal respiratory rate is crucial when administering magnesium sulfate IV, as one of the signs of magnesium toxicity is respiratory depression. Therefore, a respiratory rate of 16/min indicates that the client is not experiencing respiratory depression and it is safe to continue the magnesium sulfate infusion.
Choice B rationale:
A heart rate of 60/min is at the lower end of the normal range, which is 60 to 100 beats per minute for adults. However, bradycardia or a low heart rate can be a sign of magnesium sulfate toxicity, especially if accompanied by other symptoms such as hypotension or altered mental status. Without additional context, a heart rate of 60/min alone does not necessarily indicate it is unsafe to continue the infusion, but it would require further assessment.
Choice C rationale:
A urine output of 50 mL in 4 hours is significantly below the expected minimum of 30 mL/hour for adults. Adequate urine output is an important indicator of kidney function and is essential for the excretion of magnesium. In the case of magnesium sulfate infusion for severe preeclampsia, a low urine output could indicate renal insufficiency and an increased risk of magnesium toxicity. Therefore, a urine output of 50 mL in 4 hours is a contraindication for continuing the infusion without further evaluation.
Choice D rationale:
Diminished deep-tendon reflexes can be a sign of magnesium toxicity. Deep-tendon reflexes are assessed to monitor for signs of magnesium overdose during infusion, as magnesium acts as a central nervous system depressant at high levels. If deep-tendon reflexes are diminished, it may suggest that the serum magnesium levels are too high, and the infusion should be paused or discontinued to prevent further toxicity.
In summary, the only finding that clearly indicates it is safe to continue the magnesium sulfate infusion is a normal respiratory rate, as provided in choice A. The other options either require further assessment or are indicators of potential magnesium toxicity.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A rationale:
Stimulate the infant to cry. While stimulating the infant to cry is a common practice to assess the newborn's respiratory function, it is not the first action the nurse should perform in this situation. The newborn may cry spontaneously or may require other interventions, such as clearing the respiratory tract, before crying.
Choice B rationale:
Clear the respiratory tract. Clearing the respiratory tract is the priority action in this scenario. It ensures that the airway is open and allows the infant to breathe effectively. This is crucial because newborns are at higher risk of respiratory distress after birth, and prompt action can prevent complications.
Choice C rationale:
Dry the infant off and cover the head. Drying the infant off and covering the head are important steps to prevent heat loss and maintain the newborn's body temperature. However, these actions can be delayed briefly until the respiratory tract is cleared, as the immediate focus should be on ensuring the infant's ability to breathe.
Choice D rationale:
Clamp the umbilical cord. Clamping the umbilical cord is a standard procedure after birth to prevent bleeding and infection. However, it is not the priority in this situation. The first step should be to ensure the newborn's airway is clear and they can breathe adequately.
Correct Answer is A
Explanation
Choice A rationale :
The correct answer is A. Calcium gluconate. The nurse should administer calcium gluconate in this situation because the client's respiratory rate is 8/min, which indicates respiratory depression. Magnesium sulfate is known to cause respiratory depression as a side effect, and calcium gluconate is the antidote for magnesium sulfate toxicity. Calcium gluconate works by antagonizing the effects of magnesium on the neuromuscular junction and restoring normal respiratory function. Prompt administration of calcium gluconate can help reverse respiratory depression and prevent further complications.
Choice B rationale
Naloxone. Naloxone is not the correct choice in this scenario. Naloxone is an opioid antagonist and is used to reverse the effects of opioids in cases of opioid overdose. Since the client is receiving magnesium sulfate, which is not an opioid, naloxone would not be effective in reversing the respiratory depression caused by magnesium sulfate. Administering naloxone in this situation would not address the underlying cause and may not improve the client's condition.
Choice C rationale
Flumazenil. Flumazenil is not the correct choice in this situation. Flumazenil is a benzodiazepine antagonist and is used to reverse the effects of benzodiazepines in cases of benzodiazepine overdose. Since the client is not receiving benzodiazepines but rather magnesium sulfate, flumazenil would not be effective in treating the respiratory depression caused by magnesium sulfate. Using flumazenil in this context would not be appropriate and could potentially lead to adverse effects.
Choice D rationale
Protamine sulfate. Protamine sulfate is not the correct choice in this scenario. Protamine sulfate is an antidote for heparin overdose, not for magnesium sulfate toxicity. It works by neutralizing the effects of heparin and preventing further anticoagulation. Since the client's issue is respiratory depression caused by magnesium sulfate, administering protamine sulfate would not be helpful and would not address the primary problem.
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