Which finding is NOT reliable in diagnosing compartment syndrome?

Which finding is NOT reliable in diagnosing compartment syndrome?

• A. Pain with passive stretch
• B. Paresthesia
• C. Absent distal pulses and poor capillary refill
• D. Severe swelling

Answer: (C)

In diagnosing compartment syndrome, some signs come early and are more trustworthy, while others appear late and can mislead. The finding that is not reliable involves absent distal pulses and poor capillary refill. Distal pulses can remain present even as pressure rises, because collateral arterial flow may still supply the limb, and capillary refill can stay normal in the early to mid stages. Therefore, relying on pulses or capillary refill to make the diagnosis can miss evolving compartment syndrome. By contrast, pain that is out of proportion to exam and pain on passive stretch are more sensitive early indicators of rising pressure, and sensory changes like paresthesias signal nerve involvement. Severe swelling alone is not definitive, but the combination of severe pain with passive stretch and sensory changes should prompt urgent assessment, including pressure measurement and timely fasciotomy if indicated.

In diagnosing compartment syndrome, some signs come early and are more trustworthy, while others appear late and can mislead. The finding that is not reliable involves absent distal pulses and poor capillary refill. Distal pulses can remain present even as pressure rises, because collateral arterial flow may still supply the limb, and capillary refill can stay normal in the early to mid stages. Therefore, relying on pulses or capillary refill to make the diagnosis can miss evolving compartment syndrome.

By contrast, pain that is out of proportion to exam and pain on passive stretch are more sensitive early indicators of rising pressure, and sensory changes like paresthesias signal nerve involvement. Severe swelling alone is not definitive, but the combination of severe pain with passive stretch and sensory changes should prompt urgent assessment, including pressure measurement and timely fasciotomy if indicated.