A nurse is assessing a client who has a magnesium level of 4.4 mEq/L (1.3 to 2.1 mEq/L). Which of the following findings should the nurse expect?

A. Hypotension: Elevated magnesium levels cause smooth muscle relaxation and vasodilation, which can lead to hypotension. Severe hypermagnesemia can depress cardiovascular function, making low blood pressure a key expected finding. B. Tachycardia: Hypermagnesemia typically causes bradycardia rather than tachycardia due to its depressant effect on cardiac conduction. Tachycardia is more often associated with hypovolemia, pain, or sympathetic stimulation, not high magnesium levels. C. Muscle cramps: Muscle cramps and tetany are more commonly associated with hypomagnesemia. High magnesium levels have a neuromuscular depressant effect, leading to weakness rather than cramping. D. Hyperreflexia: Hyperreflexia occurs with low magnesium levels. In hypermagnesemia, deep tendon reflexes are diminished or absent due to the depressant effect on neuromuscular transmission.