A 31-year-old client, gravida 1, at 35 weeks of gestation with preeclampsia with severe features has received magnesium sulfate at 2 g/hour for 10 hours after a 4 g loading dose. No seizure activity has been observed. Current findings: respiratory rate 9/min, oxygen saturation 91% on room air, blood pressure 150/96 mm Hg, patellar reflexes absent, and urine output 18 mL/hour for the past 2 hours. The client is difficult to arouse but moves all extremities equally, and pupils are 3 mm, equal, and reactive. Laboratory results: serum creatinine 1.4 mg/dL (0.8 mg/dL on admission), platelets 186,000/mm3, and AST 28 units/L. Complete the diagram by selecting the condition the client is most likely experiencing, 2 actions the nurse should take to address that condition, and 2 parameters the nurse should monitor to assess the client's progress.

Quick answer
Magnesium sulfate toxicity; stop the infusion, give prescribed IV calcium gluconate, and monitor respiratory rate and serum magnesium level.

Why this is correct
Magnesium is excreted by the kidneys, and this client's urine output has fallen with a creatinine rising from 0.8 to 1.4 mg/dL, so magnesium accumulates. Loss of reflexes comes first, then respiratory depression and reduced consciousness. Stopping the source and giving calcium to antagonize magnesium at the neuromuscular junction are the immediate treatments.

Easy analogy or mental picture
Picture a bathtub with the tap running (the infusion) and the drain partly blocked (the kidneys): the water rises until it spills over. Turn off the tap first.

Memory hook
Reflexes gone, breaths under 12, urine under 30 = shut off magnesium, grab calcium.

NCLEX decision rule
During a high-alert infusion, new depression of reflexes, breathing, or consciousness means stop the drug and give its antidote before looking for other causes.

Why the other choices are wrong
HELLP syndrome would show low platelets and elevated liver enzymes, which are normal here, so trending platelets does not track this problem. A postictal state requires a seizure, and none occurred. Intracranial hemorrhage would produce focal deficits or unequal pupils, so pupil checks are less specific. Labetalol is for severe-range pressure of 160/110 mm Hg or higher, which this client does not have. A fluid bolus risks pulmonary edema in preeclampsia and does not treat toxicity, and reducing the rate continues giving a drug the client cannot clear. The protein-to-creatinine ratio describes preeclampsia severity, not magnesium levels.