A nurse is assessing a client with severe pre-eclampsia who is receiving magnesium sulfate infusion.
Which finding should alert the nurse to suspect magnesium toxicity?
Respiratory rate of 10 breaths/min
Deep tendon reflexes of 2+
Urine output of 40 mL/hour
Serum magnesium level of 6 mq/L
The Correct Answer is A
Respiratory rate of 10 breaths/min.
This is a sign of magnesium toxicity, which can occur when a client receives magnesium sulfate infusion for severe pre-eclampsia. Magnesium toxicity can cause muscle weakness, difficulty breathing, irregular heartbeats, and cardiac arrest.
Choice B is wrong because deep tendon reflexes of 2+ are normal and do not indicate magnesium toxicity.
Choice C is wrong because urine output of 40 mL/hour is adequate and does not indicate magnesium toxicity.
The minimum urine output for an adult is 30 mL/hour.
Choice D is wrong because serum magnesium level of 6 mEq/L is within the normal range of 1.7 to 2.3 mEq/L and does not indicate magnesium toxicity. Magnesium levels above 2.6 mEq/L can indicate hypermagnesemia.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Respiratory rate of 10 breaths/minute.This indicates that the client is experiencingmagnesium toxicity, which can causemuscle weakness,difficulty breathing, andcardiac arrest.The normal respiratory rate for adults is 12 to 20 breaths/minute.
Choice B is wrong because deep tendon reflexes of 2+ are normal and do not indicate magnesium toxicity.
Choice C is wrong because urinary output of 40 mL/hour is within the normal range of 30 to 50 mL/hour.Magnesium toxicity can cause urine retention, not increased output.
Choice D is wrong because serum magnesium level of 6 mEq/L is within the normal range of 1.7 to 2.3 mEq/L.Magnesium toxicity occurs when the level is above 2.6 mEq/L.
Correct Answer is A
Explanation
Stop the magnesium sulfate infusion.
The client is showing signs of magnesium toxicity, such as absent deep tendon reflexes, which can lead to respiratory depression and cardiac arrest.
Magnesium sulfate is an anticonvulsant that is used to prevent seizures in eclampsia, but it can also cause vasodilation and hypotension.
The nurse should stop the infusion and monitor the client’s vital signs and neurological status.
Choice B. Increase the rate of the hydralazine infusion is wrong because hydralazine is an antihypertensive that lowers blood pressure.
The client’s blood pressure is already within the normal range for eclampsia (140/90 to 160/110 mmHg), so increasing the rate of hydralazine could cause hypotension and compromise placental perfusion.
Choice C. Administer calcium gluconate IV push is wrong because calcium gluconate is an antidote for magnesium toxicity, but it should not be given IV push.
It should be given slowly over 10 to 20 minutes to avoid cardiac arrhythmias and bradycardia.
Choice D. Prepare for immediate delivery of the fetus is wrong because delivery of the fetus is not indicated at this time.
The client’s vital signs are stable and there is no evidence of fetal distress or placental abruption.
Delivery of the fetus is the definitive treatment for eclampsia, but it should be done when the maternal and fetal conditions are optimal.
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