A client had a long fiberglass cast applied to the lower leg…

A client had a long fiberglass cast applied to the lower leg earlier today for a tibial fracture. During the afternoon assessment, the client reports the leg “feels like it is going to burst” and has increasing pain unrelieved by the prescribed analgesic. The nurse notes the toes are pale, swollen, and capillary refill is greater than 3 seconds. What is the priority nursing action?