In preparation for cardiac surgery, a client was taught about measures to take post surgery. What statement indicates to the nurse that the client clearly understood this education?

After cardiac surgery, clients are at significant risk for deep vein thrombosis (DVT) and pulmonary embolism due to prolonged immobility, inflammation, and altered coagulation. Avoiding leg crossing is an important preventive measure because crossing the legs compresses the popliteal vessels, impedes venous return, and promotes blood stasis — all of which increase DVT risk. Instructing the client not to cross their legs when resting demonstrates accurate understanding of post-surgical thromboembolism prevention. Keeping pillows under the knees is actually contraindicated because it creates the same venous compression problem as crossing legs — the sustained pressure on the popliteal fossa obstructs circulation and increases clot risk. Wearing compression stockings only when calf pain occurs is wrong; they should be applied prophylactically before pain develops, and calf pain may indicate a DVT has already formed. Staying in bed for the first few days contradicts the current evidence-based practice of early progressive ambulation after cardiac surgery, which is one of the most effective strategies for reducing DVT, improving respiratory function, and enhancing recovery. The instruction to avoid leg crossing is thus the only statement demonstrating clear comprehension of post-operative education.