Exam Guide
The Earliest Sign of Compartment Syndrome
Musculoskeletal & Perfusion · Question from the ATI RN Medical-Surgical 2023 Proctored Exam study set
Correct answer: C. Severe pain unrelieved by meds
Why this is the answer
Pain out of proportion to the injury, and pain that doesn't respond to the usual dose of opioids, is the hallmark earliest warning of rising pressure inside the compartment. Pulselessness (A) and paralysis (B) are late findings — by the time pulses disappear or movement is lost, significant tissue damage has often already occurred. Pallor (D) is part of the classic "6 Ps" of compartment syndrome/vascular compromise, but it also tends to appear later than the initial pain change.
The bigger concept
Compartment syndrome is a time-critical emergency because permanent muscle and nerve damage can occur within hours — which is exactly why the earliest sign (disproportionate, unrelieved pain) is worth memorizing precisely rather than waiting for the more dramatic, later "6 Ps" to appear.
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