The nurse is giving instructions to a client who is going home with a cast on his leg. Which point is most critical ？（）
A．Using crutches properly.
B．Exercising joints above and below the cast, as ordered.
C．Avoiding walking on a leg cast without the physician's permission.
D．Reporting signs of impaired circulation.
参考答案：D
解析：
Although all of these interventions are important, reporting signs of impaired circulation is the most critical. Signs of impaired circulation must be reported to the physician immediately to prevent permanent damage. The other options reflect more long- term concerns. The client should learn to use his crutches properly to avoid nerve damage. The client may exercise above and below the cast, as the physician orders. The client should be told not to walk on the cast without the physician's permission.