The nurse is caring for a patient who just returned from surgical decompression of the carpal tunnel. Which finding requires the nurse's immediate action?

A. Fingers being pink and cool bilaterally may be expected postoperatively due to anesthesia or positioning and does not indicate an immediate complication. B. A capillary refill time of 8 seconds is significantly prolonged (normal is ≤2 seconds) and may indicate compromised circulation, possibly due to compartment syndrome or vascular compromise. This requires immediate action to preserve limb function. C. A pain level of 5/10 is moderate and may be expected after surgery. It does not indicate an urgent issue unless unrelieved by medication or out of proportion to the procedure. D. Swollen and warm fingers may be part of the normal inflammatory process after surgery but are not immediately life- or limb-threatening.