Which assessment in a client diagnosed with pregnancy-induced hypertension who is taking magnesium sulfate would indicate a therapeutic level of medication?
a. Urinary output of 20 ml/hr
b. Normal deep tendon reflexes
c. Respiratory rate of 10 to 12 breaths/minute
d. Drowsiness
B
Magnesium sulfate is administered for pregnancy-induced hypertension to reduce the risk of seizures from cerebral irritability. Hyperreflexia (deep tendon reflexes above normal) is a symptom of cerebral irritability. If dosage of magnesium sulfate is effective, reflexes should decrease to normal or slightly below normal levels.
A urinary output of 20 ml/hr is not adequate output.
A respiratory rate of 10 to 12 breaths/minute is too slow and could be indicative of magne-sium toxicity.
Drowsiness is another sign of CNS depression from magnesium toxicity.
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