A nurse is caring for a client who has eclampsia and is receiving magnesium sulfate and hydralazine.

The client’s blood pressure is 150/90 mmHg, pulse is 88/min, respirations are 18/min, and oxygen saturation is 97%.

The nurse notes that the client’s deep tendon reflexes are absent.

Which of the following actions should the nurse take?

The correct answer is A and B. A. Serum magnesium level of 8 mg/dL

This statement is correct because a serum magnesium level of 8 mg/dL (6.6 mmol/L) is within the therapeutic range for eclampsia treatment, which is 3.5 to 7 mEq/L (4.2 to 8.4 mg/dL) according to some sources, or 1.5 to 3.5 mmol/L according to others.A serum magnesium level above 8 mEq/L (10 mmol/L) can cause areflexia, respiratory paralysis, and cardiac arrest.

B. Serum calcium level of 7 mg/dL

This statement is correct because a serum calcium level of 7 mg/dL (1.75 mmol/L) is below the normal range of 8.5 to 10.2 mg/dL (2.12 to 2.55 mmol/L), which indicates hypocalcemia.Hypocalcemia is a common side effect of magnesium sulfate therapy, as magnesium competes with calcium for binding sites on plasma proteins and cell membranes, and also inhibits the release of parathyroid hormone.

C. Serum creatinine level of 1.2 mg/dL

This statement is wrong because a serum creatinine level of 1.2 mg/dL (106 umol/L) is within the normal range of 0.6 to 1.3 mg/dL (53 to 115 umol/L) for women.Serum creatinine level reflects kidney function, and renal impairment can affect the clearance of magnesium sulfate and increase the risk of toxicity.

D. Serum potassium level of 3.8 mEq/L

This statement is wrong because a serum potassium level of 3.8 mEq/L (3.8 mmol/L) is within the normal range of 3.5 to 5 mEq/L (3.5 to 5 mmol/L) for adults.Serum potassium level reflects electrolyte balance, and hypokalemia or hyperkalemia can affect cardiac function and muscle contraction.

E. Serum sodium level of 140 mEq/L

This statement is wrong because a serum sodium level of 140 mEq/L (140 mmol/L) is within the normal range of 135 to 145 mEq/L (135 to 145 mmol/L) for adults.Serum sodium level reflects fluid balance, and hyponatremia or hypernatremia can affect brain function and blood pressure.

Respiratory rate 10/min.This indicatesmuscle weaknessanddifficulty breathing, which are symptoms ofmagnesium toxicity.Magnesium sulfate is a medication that can cause magnesium overdose if given in excess or if the patient has impaired kidney function.

Choice B.Urine output 40 mL/hr is wrong because this is within the normal range for urine output, which is 30 to 50 mL/hr.Urine output may decrease in severe cases of magnesium toxicity due to urine retention.

Choice C. Patellar reflex 2+ is wrong because this is a normal finding for the knee-jerk reflex.A low or absent patellar reflex may indicate magnesium toxicity, as it reflectsmuscle weaknessandnerve dysfunction.

Choice D.Serum magnesium level 4.5 mEq/L is wrong because this is within the normal range for serum magnesium, which is 1.7 to 2.3 mEq/L.Serum magnesium levels above 2.6 mEq/L can indicate hypermagnesemia or magnesium overdose.