A nurse is assessing a client who has preeclampsia and is receiving magnesium sulfate via continuous IV infusion. For which of the following therapeutic effects should the nurse monitor the client?

Rationale: A. Urine output 20 mL/hr: This urine output is below the recommended minimum of 30 mL/hr and may indicate magnesium toxicity or worsening renal perfusion. It is not a therapeutic effect and requires prompt evaluation. B. BP 150/92 mm Hg: This blood pressure is still elevated and does not indicate optimal control of preeclampsia. Magnesium sulfate is given to prevent seizures, not primarily to lower blood pressure, so this is not a measure of therapeutic effect. C. Absence of eclampsia: Magnesium sulfate is administered in preeclampsia to prevent the onset of eclampsia (seizures). The absence of seizure activity indicates that the medication is having its intended therapeutic effect. D. FHR 116/min: This fetal heart rate is within the normal baseline range of 110–160/min, but it is not a direct therapeutic effect of magnesium sulfate. It is more a reflection of fetal well-being rather than the drug’s primary purpose.