A nurse is administering IV mannitol to a client diagnosed with cerebral edema. Which of the following actions should the nurse perform prior to the administration of mannitol?

Cerebral edema involves increased intracranial pressure due to fluid accumulation within brain tissues, which can lead to decreased cerebral perfusion and neurological deterioration. Mannitol is an osmotic diuretic used to reduce intracranial pressure by drawing fluid from brain tissue into the intravascular space for renal excretion. Because mannitol can crystallize at room temperature, proper preparation and safety checks are essential before IV administration to prevent harm and ensure therapeutic effectiveness. Rationale: A. Checking for crystallization in the mannitol solution is essential before administration because mannitol can form crystals when stored at low temperatures. Infusing crystallized solution can cause catheter occlusion or embolization. If crystals are present, the solution should be warmed or filtered before use to ensure safe administration. B. Administering mannitol rapidly over 10 minutes is unsafe unless specifically prescribed, as rapid infusion can cause sudden fluid shifts and cardiovascular overload. Mannitol should be administered at the prescribed controlled rate to prevent complications such as pulmonary edema, hypotension, or electrolyte imbalance. Proper infusion timing is critical to avoid adverse hemodynamic effects. C. Ensuring systolic blood pressure is below 100 mm Hg is not a required pre-administration parameter for mannitol. While blood pressure monitoring is important due to the risk of fluid shifts and osmotic diuresis, the drug is not contraindicated based solely on systolic pressure thresholds. The focus is on intracranial pressure reduction rather than strict blood pressure limits. D. Administering mannitol with food to improve absorption is incorrect because mannitol is given intravenously, not orally. Food intake has no effect on its absorption or pharmacologic action. Its therapeutic effect depends entirely on controlled IV infusion and its osmotic movement across the blood-brain barrier.