A nurse is monitoring a client who is receiving magnesium sulfate for severe preeclampsia.The client asks, "How will I know if the medication is working?" Which response by the nurse is most appropriate?

Choice A rationaleWhile magnesium sulfate can sometimes lead to a mild diuresis, its primary therapeutic effect in severe preeclampsia is not a direct reduction in swelling and fluid retention. These symptoms are more effectively managed by addressing the underlying hypertension and potential fluid overload through other interventions.Choice B rationaleMagnesium sulfate is primarily used as an anticonvulsant and to lower blood pressure in severe preeclampsia. While it might indirectly alleviate some discomfort associated with preeclampsia, a direct reduction in pain and headaches is not the primary indicator of its therapeutic effectiveness.Choice C rationaleMagnesium sulfate does have antihypertensive properties and can help lower blood pressure in severe preeclampsia. However, its most critical role is in preventing seizures. Therefore, monitoring blood pressure alone is not the most appropriate way to determine if the medication is working effectively in preventing seizures. Normal blood pressure is typically less than 120/80 mmHg.Choice D rationaleMagnesium sulfate is administered in severe preeclampsia primarily to prevent seizures and may also have a relaxing effect on smooth muscles, which can improve hyperreflexia. A decrease in seizure activity and the normalization of deep tendon reflexes (normal range is 2+) are key indicators that the magnesium sulfate is achieving its therapeutic goals.