Which medication is appropriate for a client exhibiting Cushing's Triad following a subdural hematoma?

In the context of a patient exhibiting Cushing's Triad, which is characterized by hypertension, bradycardia, and irregular respirations often due to increased intracranial pressure (ICP), the appropriate medication to administer is Mannitol 25%.

Mannitol is an osmotic diuretic that helps to reduce ICP by pulling excess water from the brain tissue into the bloodstream, thereby decreasing brain edema. This action is crucial in managing elevated ICP, particularly in cases like a subdural hematoma where the accumulation of blood can lead to increased pressure within the cranial cavity. By effectively lowering ICP, Mannitol helps restore normal cerebral perfusion and can prevent further neurological impairment.

While the other medications listed may have their specific uses in different contexts, they do not directly address the critical need to reduce intracranial pressure in the setting of Cushing's Triad. Furosemide is a loop diuretic, typically used for fluid overload but less effective for direct ICP reduction. Carbonic anhydrase inhibitors can be used for conditions like glaucoma or altitude sickness, but are not the first line for ICP management. Phenobarbital is primarily an anticonvulsant, used for seizure control, which may not address the immediate