Which of the following is contraindicated in head injury?
**Core Concept**
The management of head injury requires careful consideration of various medications to prevent further brain damage. The use of certain medications can exacerbate cerebral edema, increase intracranial pressure (ICP), or worsen brain injury.
**Why the Correct Answer is Right**
Mannitol is a potent osmotic diuretic that is commonly used to reduce ICP in patients with head injury. However, mannitol can also cause dehydration, which can lead to a decrease in cerebral blood flow and worsen brain injury. Moreover, mannitol can cause a rebound increase in ICP after its initial effect wears off. In patients with head injury, the risks associated with mannitol use outweigh its benefits, and it is generally contraindicated.
**Why Each Wrong Option is Incorrect**
**Option A:** Furosemide is a loop diuretic that is not typically used to manage head injury. While it can cause dehydration, its use is not directly contraindicated in this setting.
**Option B:** Phenytoin is an antiepileptic medication that may be used to prevent seizures in patients with head injury. It does not have a direct effect on ICP or cerebral edema.
**Option C:** Corticosteroids, such as dexamethasone, were once used to reduce ICP in patients with head injury. However, their use has been largely discontinued due to a lack of efficacy and potential harm, not because of a direct contraindication.
**Clinical Pearl / High-Yield Fact**
In patients with head injury, it is essential to use medications that do not exacerbate cerebral edema or increase ICP. Medications like mannitol, which can cause dehydration and worsen brain injury, should be avoided.
**Correct Answer:** C.