What describes a typical DVT/PE prophylaxis protocol and its timing relative to surgery?

• A. Preoperative pharmacologic prophylaxis only, with no postoperative measures.
• B. Prophylaxis is unnecessary for most surgeries.
• C. Pharmacologic and mechanical prophylaxis based on risk; typically started postoperatively for surgical patients at risk to prevent thromboembolism.
• D. Only mechanical prophylaxis is used, not pharmacologic.

Answer: (C)

The main idea is that DVT/PE prevention in surgical patients relies on a risk-based combination of therapies, with timing usually postoperatively. After surgery and once hemostasis is secured, many patients at risk receive pharmacologic prophylaxis (such as anticoagulants like heparin or low-molecular-weight heparin) alongside mechanical measures (like sequential compression devices or graduated compression stockings) to reduce venous stasis and clot formation. In patients with bleeding risk or contraindications, mechanical methods may be used alone or adjusted, but the goal is to tailor the plan to the individual's risk and bleed tolerance. Starting pharmacologic prophylaxis before surgery is not the standard for most cases due to bleeding concerns, and saying prophylaxis isn’t needed at all is inaccurate, while using only mechanical methods omits the proven benefits of pharmacologic measures in many patients.