A nurse is administering magnesium sulfate IV to a client who has severe preeclampsia.
Which of the following assessments should the nurse perform to monitor for magnesium toxicity? Select all that apply.
Deep tendon reflexes
Respiratory rate
Urine output
Fetal heart rate
Serum magnesium level
Correct Answer : A,B,C,E
The correct answer is choice A, B, C and E. The nurse should monitor for magnesium toxicity by assessing the deep tendon reflexes, respiratory rate, urine output and serum magnesium level of the client who has severe preeclampsia and is receiving magnesium sulfate IV. Magnesium toxicity can cause life-threatening complications such as hypotension, areflexia (loss of DTRs), respiratory depression, respiratory arrest, oliguria, shortness of breath, chest pains, slurred speech and cardiac arrest. The nurse should also have calcium chloride ready as an antidote for magnesium toxicity.
Choice D is wrong because fetal heart rate is not a direct indicator of magnesium toxicity. However, the nurse should still monitor the fetal heart rate and uterine activity per the Electronic Fetal Monitoring (EFM) Guideline.
Normal ranges for the assessments are:
• Deep tendon reflexes: 1+ to 4+ (normal to hyperactive)
• Respiratory rate: 12 to 20 breaths per minute
• Urine output: at least 30 mL per hour
• Serum magnesium level: 4 to 7 mg/dL (therapeutic range for preeclampsia)
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Related Questions
Correct Answer is A
Explanation
Absence of seizures indicates a therapeutic response to magnesium sulfate therapy for a client with eclampsia.Magnesium sulfate is used to prevent seizures in women with preeclampsia, a complication of pregnancy characterized by high blood pressure and organ dysfunction.Magnesium sulfate may act as a vasodilator, an anticonvulsant, and a protector of the blood-brain barrier.
Choice B is wrong because a decrease in urine output may indicate renal impairment, which is a complication of preeclampsia and eclampsia.
Choice C is wrong because an increase in deep tendon reflexes may indicate hyperreflexia, which is a sign of increased neuromuscular irritability and a risk factor for seizures.
Choice D is wrong because an increase in respiratory rate may indicate respiratory distress, which can be caused by pulmonary edema, another complication of preeclampsia and eclampsia.
Normal ranges for urine output are 0.5 to 1 mL/kg/hour, for deep tendon reflexes are 1+ to 2+, and for respiratory rate are 12 to 20 breaths per minute.
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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