When assessing a client after a closed reduction of a fractured humerus, which sign indicates a potential compartment syndrome?

The sign indicating potential compartment syndrome after a closed reduction of a fractured humerus is characterized by capillary refill and temperature changes. In compartment syndrome, increased pressure within a closed muscular compartment can lead to reduced blood flow, resulting in ischemia.

Capillary refill time is a quick test to assess peripheral perfusion. In a normal situation, the color of the nail bed should return to pink within a couple of seconds after pressure is applied. A delayed capillary refill could indicate compromised blood flow, which is a hallmark of compartment syndrome. Similarly, changes in the temperature of the affected area may occur, as the compromised blood flow can lead to cooler temperatures in the extremities.

The combination of these factors serves as essential indicators for assessing a patient for compartment syndrome, as early detection is crucial to prevent permanent damage to the muscles and nerves within the affected compartment. Thus, capillary refill and temperature changes are definitive signs that healthcare providers closely monitor in patients who may develop this condition following musculoskeletal injuries or procedures.