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J.R. sustained a leg fracture that was surgically aligned and casted. Six hours after casting of his leg, he begins to complain of increasing leg pain. Assessment of the extremity demonstrates pulselessness and pallor. The appropriate action to take is to A) increase the administration of J.R.'s pain medication. B) initiate action to have the cast split or removed. C) note the increase in pain in J.R.'s chart, and recheck the extremity in 30 minutes. D) elevate the extremity to relieve swelling.