Which sign is an early indicator of compartment syndrome?

Which sign is an early indicator of compartment syndrome?

• A. Paresthesia
• B. Severe pain with passive stretch of the involved muscles
• C. Pallor
• D. Pulsatile limb pulses

Answer: (B)

Early compartment syndrome presents with severe pain that is out of proportion to examination findings, and this pain becomes particularly evident when the involved muscles are passively stretched. This happens because the rising pressure inside the closed muscle compartment reduces blood flow and irritates nerves; stretching the muscle exacerbates ischemia, producing marked pain that is a sensitive early indicator. Pulses and color changes tend to appear later. Diminished or absent pulses imply established ischemia and vascular compromise, not the first clue, and pulses can still be present despite high intracompartmental pressure due to collateral circulation. Paresthesias can occur as nerves become ischemic, but the hallmark early sign clinicians watch for is pain with passive stretch, which guides urgent evaluation and management.

Early compartment syndrome presents with severe pain that is out of proportion to examination findings, and this pain becomes particularly evident when the involved muscles are passively stretched. This happens because the rising pressure inside the closed muscle compartment reduces blood flow and irritates nerves; stretching the muscle exacerbates ischemia, producing marked pain that is a sensitive early indicator.

Pulses and color changes tend to appear later. Diminished or absent pulses imply established ischemia and vascular compromise, not the first clue, and pulses can still be present despite high intracompartmental pressure due to collateral circulation. Paresthesias can occur as nerves become ischemic, but the hallmark early sign clinicians watch for is pain with passive stretch, which guides urgent evaluation and management.