A nurse is caring for a client who is postoperative. Which of the following nursing interventions reduce the risk of thrombus development? Select all.

The correct answers are B and E. Applying elastic stockings helps promote circulation and prevent stasis, reducing the risk of thrombus formation. Assisting the client to change position often prevents prolonged immobility, which can lead to blood pooling and clot formation. Choice A is incorrect because the Valsalva maneuver can increase intra-abdominal pressure, potentially leading to venous stasis and thrombus formation. Choice C is irrelevant to thrombus prevention. Placing pillows under the client's knees and lower extremities (choice D) may promote comfort but does not directly reduce thrombus risk.