Name two first-line osmotic therapies used to reduce intracranial pressure in TBI.

Name two first-line osmotic therapies used to reduce intracranial pressure in TBI.

• A. Mannitol and hypertonic saline
• B. Hypertonic saline alone
• C. Mannitol alone
• D. Furosemide and dexamethasone

Answer: (A)

First, understand how osmotic therapies help with brain swelling: they create a gradient that pulls water out of swollen brain tissue into the bloodstream, reducing intracranial pressure. Mannitol, given IV, raises plasma osmolality so water moves from brain to blood. Hypertonic saline does the same thing and also helps maintain blood pressure by expanding intravascular volume, which can support cerebral perfusion. Using either of these agents as a first-line approach is standard in acute TBI to rapidly lower ICP. The other options don’t fit because furosemide is a diuretic without the same targeted osmotic effect, and dexamethasone has not shown benefit in TBI and can be harmful. The combination of mannitol and hypertonic saline represents the two primary first-line osmotic therapies used to reduce ICP.

First, understand how osmotic therapies help with brain swelling: they create a gradient that pulls water out of swollen brain tissue into the bloodstream, reducing intracranial pressure. Mannitol, given IV, raises plasma osmolality so water moves from brain to blood. Hypertonic saline does the same thing and also helps maintain blood pressure by expanding intravascular volume, which can support cerebral perfusion. Using either of these agents as a first-line approach is standard in acute TBI to rapidly lower ICP. The other options don’t fit because furosemide is a diuretic without the same targeted osmotic effect, and dexamethasone has not shown benefit in TBI and can be harmful. The combination of mannitol and hypertonic saline represents the two primary first-line osmotic therapies used to reduce ICP.