When caring for a patient with a newly applied leg cast, which action is appropriate?

Supporting the entire length of the cast with pillows is appropriate because it helps in maintaining proper alignment and stability of the limb while it is immobilized. This support reduces the risk of pressure sores and provides comfort to the patient. Proper support ensures that the cast remains intact without shifting, which is crucial for the healing process of the fractured bone.

Using pillows to cradle the cast also distributes weight evenly and can help in elevating the limb, which may be beneficial for reducing swelling. Good support is essential in the initial healing stages after a cast is applied, as it minimizes stress on the injured area and promotes better circulation, which is vital for healing.

While covering the cast with a light blanket or plastic sheet is often done to protect it, it does not provide the necessary support required during the drying and curing phase. Keeping the patient in one position until the cast dries may not be practical or comfortable, as movement is often encouraged as long as it does not compromise the cast. Placing the cast on a hard, level surface could lead to pressure points and discomfort if the cast is not supported properly, which is why providing support with pillows is the most suitable choice.