**Core Concept**
The management of spinal cord injury (SCI) and the prevention of secondary injury involves the administration of high-dose methylprednisolone. This corticosteroid reduces inflammation and edema in the spinal cord, potentially limiting the extent of injury.

**Why the Correct Answer is Right**
High-dose methylprednisolone is administered intravenously at a dose of 30 mg/kg over 15 minutes, followed by an infusion of 5.4 mg/kg/hour for 23 hours. This regimen is based on the National Acute Spinal Cord Injury Study (NASCIS) II and III trials, which showed improved outcomes in patients with acute SCI. The mechanism of action involves the reduction of inflammation and the stabilization of the blood-spinal cord barrier, thereby limiting the extent of secondary injury.

**Why Each Wrong Option is Incorrect**
* **Option A:** Lower doses of methylprednisolone may not provide adequate anti-inflammatory effects to prevent secondary injury.
* **Option B:** The duration of methylprednisolone administration is critical, as shorter or longer infusions may not provide optimal benefits.
* **Option D:** The correct dose of methylprednisolone must be initiated within 8 hours of injury for maximum benefit.

**Clinical Pearl / High-Yield Fact**
The administration of high-dose methylprednisolone within 8 hours of spinal cord injury is crucial for optimal outcomes. This time-sensitive intervention is a key component of acute SCI management.

**Correct Answer:** C. 30 mg/kg over 15 minutes, followed by an infusion of 5.4 mg/kg/hour for 23 hours.