A nurse is caring for a postoperative client following a total knee replacement. Which medication should the nurse anticipate the provider to prescribe to prevent the formation of a deep vein thrombosis (DVT)?

A. Continuous heparin infusions are typically reserved for the treatment of an existing, confirmed thrombus or for high-risk cardiac conditions rather than routine postoperative prophylaxis. This form of anticoagulation requires intensive monitoring of the activated partial thromboplastin time (aPTT) and carries a higher risk of surgical site bleeding. It is not the standard first-line choice for preventing a DVT after an orthopedic procedure. B. Alteplase is a thrombolytic agent, or "clot buster," used to dissolve established, life-threatening thrombi in cases of ischemic stroke or massive pulmonary embolism. Using it prophylactically after a total knee replacement would be extremely dangerous and likely cause catastrophic postoperative hemorrhage. Thrombolytics work by activating plasminogen and are never used as a standard preventative measure for venous thromboembolism. C. Enoxaparin is a low-molecular-weight heparin that is the clinical standard for DVT prophylaxis following major orthopedic surgeries like knee replacements. It provides a predictable anticoagulant response and does not require routine laboratory monitoring of clotting times. Administering it subcutaneously effectively inhibits Factor Xa, reducing the risk of clot formation while the patient is in the high-risk, immediate postoperative recovery phase. D. While aspirin has antiplatelet properties and is sometimes used in specific long-term orthopedic protocols, it is generally considered less potent than enoxaparin for preventing venous thromboembolism. Aspirin primarily targets arterial clot formation rather than the venous stasis issues seen after surgery. Most acute care protocols prioritize pharmacological anticoagulants like enoxaparin to ensure the highest level of protection against deep vein thrombosis.