A client with a new cast on the left forearm reports severe, throbbing pain that is unrelieved by prescribed opioid analgesics, and the fingers are cool and pale. What is the priority nursing action?

✓ Correct Answer: Option C

The symptoms (unrelieved pain, pallor, coolness) are classic signs of compartment syndrome, a medical emergency. Immediate notification of the healthcare provider is crucial for prompt intervention to prevent permanent tissue damage.