Earliest sign of compartment syndrome of leg is:
**Core Concept**
Compartment syndrome of the leg is a condition where increased pressure within the muscle compartments (fascial compartments) compromises circulation and nerve function, leading to muscle and nerve damage. This condition often results from trauma, fractures, or prolonged immobilization, causing swelling and pressure buildup within the confined spaces.
**Why the Correct Answer is Right**
The earliest sign of compartment syndrome of the leg is typically pain out of proportion to the apparent injury, often described as a "crushing" or "burning" sensation. This pain is due to increased pressure within the muscle compartments, which compresses the nerves and blood vessels, leading to ischemia and nerve damage. The affected individual may exhibit a positive "squeezing" test, where they experience increased pain when the affected compartment is palpated or squeezed.
**Why Each Wrong Option is Incorrect**
* **Option A:** Paresthesia or numbness may be present in advanced cases, but it is not the earliest sign.
* **Option B:** Swelling is a common finding in compartment syndrome, but it is not the earliest sign; swelling often follows the initial pain.
* **Option C:** Weakness and paralysis can occur in severe cases, but they are not the earliest signs; these symptoms typically develop after prolonged ischemia.
* **Option D:** Loss of pulse is a late sign of compartment syndrome, often indicating severe vascular compromise.
**Clinical Pearl / High-Yield Fact**
The "5 Ps" of compartment syndrome are: Pain, Pallor, Pulselessness, Paraesthesia, and Paralysis. Remembering these symptoms can help you identify compartment syndrome at an early stage.
**Correct Answer: C. Pain out of proportion to the apparent injury.**