What sign should a nurse look for to indicate potential infection in a casted extremity?

A "hot spot" on the cast is a significant indicator of potential infection in a casted extremity. This sign suggests that there is increased warmth in a localized area, which can be a response to inflammation due to infection. When an infection occurs, the body's immune response increases blood flow to the area, leading to elevated temperatures that can be detected through the cast.

Monitoring for hot spots is crucial because an associated rise in temperature could indicate complications such as osteomyelitis or other deep tissue infections, which require prompt medical attention. Recognizing these signs allows for early intervention and reduces the risk of serious complications.

The other options do not signify an infection as clearly. A cold spot could indicate inadequate circulation but is not specific to infection. Swelling around the edges of the cast might indicate issues such as compartment syndrome rather than an infection, and no changes in skin temperature suggest that the extremity is stable and likely free from infection. Therefore, identifying a hot spot serves as a vital assessment tool in nursing care for patients with casted extremities.