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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Correct Answer is A
Explanation
The client has no seizures.Magnesium sulfate therapy is used to prevent seizures in women with preeclampsia and eclampsia.Seizures are a life-threatening complication of eclampsia and indicate a failure of therapy.
Choice B is wrong because diuresis is not a goal of magnesium sulfate therapy.Diuresis may indicate fluid overload or renal impairment, which are complications of preeclampsia and eclampsia.
Choice C is wrong because improved fetal movement is not a direct outcome of magnesium sulfate therapy.Fetal movement may be affected by many factors, such as gestational age, maternal position, and fetal well-being.
Choice D is wrong because increased platelet count is not a result of magnesium sulfate therapy.Platelet count may be decreased in preeclampsia and eclampsia due to disseminated intravascular coagulation, which is a serious complication that requires prompt treatment.
Normal ranges for blood pressure are less than 140/90 mm Hg, for proteinuria are less than 300 mg/24 hours, for platelet count are 150,000 to 400,000/mm3, and for serum magnesium are 1.5 to 2.5 mEq/L.
Correct Answer is C
Explanation
Calcium gluconate is the antidote for magnesium sulfate overdose.Magnesium sulfate blocks calcium, so calcium gluconate can reverse the effect of an overdose.
The other choices are not antidotes for magnesium sulfate.Choice A, naloxone, is the antidote for narcotics or opioid overdose.Choice B, flumazenil, is the antidote for benzodiazepine overdose.Choice D, protamine sulfate, is the antidote for heparin overdose.The normal range of magnesium level is 1.5 to 2.5 mEq/L, so a level of 10 mg/dL indicates toxicity.
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