A nurse is caring for a patient post-total knee arthroplasty. Which intervention should be prioritized to prevent deep vein thrombosis (DVT)?

Choice A rationale Limiting fluid intake is detrimental to a post-surgical patient as it increases blood viscosity and promotes stasis. Dehydration can lead to hemoconcentration, which is a significant risk factor for the formation of thrombi in the deep veins of the legs. Maintaining adequate hydration is essential to ensure smooth blood flow and to decrease the concentration of clotting factors. Nurses should encourage fluids rather than restrict them to help maintain optimal hemodynamic stability and venous return. Choice B rationale Early ambulation is the gold standard for preventing deep vein thrombosis after orthopedic surgery. Physical movement activates the skeletal muscle pump in the calves, which compresses the deep veins and propels blood back toward the heart. This prevents venous stasis, one of the components of Virchow's triad. By getting the patient out of bed early, the nurse reduces the time blood spends pooling in the lower extremities, significantly lowering the probability of clot formation. Choice C rationale While frequent blood pressure monitoring is necessary to assess the patient's general cardiovascular status and recovery from anesthesia, it does not directly prevent the formation of a deep vein thrombosis. Blood pressure readings reflect systemic vascular resistance and cardiac output but do not address the localized venous stasis occurring in the lower limbs. While a normal blood pressure of 120 over 80 mmHg is ideal, it is not a specific preventative measure for venous thromboembolism. Choice D rationale Application of ice packs is primarily used to reduce localized edema and provide analgesia at the surgical site. While it helps manage inflammation, it does not prevent the systemic or regional conditions that lead to deep vein thrombosis. In some cases, extreme cold might cause localized vasoconstriction, which could theoretically slow blood flow if applied incorrectly. The focus for DVT prevention must remain on promoting venous return through mechanical means like ambulation or compression devices.