What is the highest risk factor for developing a deep vein thrombosis?

What is the highest risk factor for developing a deep vein thrombosis?

• A. Inactivity
• B. Age over 60
• C. Recent surgery
• D. Cancer

Answer: (A)

The key idea is venous stasis: when the legs aren’t moving, blood pools in the deep veins because the calf muscles aren’t acting as a pump to push blood back toward the heart. This slow flow makes it easier for clotting factors to form a thrombus, so inactivity directly creates the conditions that lead to deep vein thrombosis. Among common risk factors, prolonged immobility is the most pervasive way to induce stasis, which is why it’s the strongest factor in this context. Surgery and cancer are important too because they raise clotting tendency and can injure vessels, but without movement the stagnant blood greatly favors clot formation, making inactivity the more influential risk in many scenarios. Age over 60 adds risk, though its effect is incremental compared to the immediate impact of being inactive. In practice, staying active and moving the legs when possible, plus preventive measures during periods of immobilization, are essential to reduce this risk.

The key idea is venous stasis: when the legs aren’t moving, blood pools in the deep veins because the calf muscles aren’t acting as a pump to push blood back toward the heart. This slow flow makes it easier for clotting factors to form a thrombus, so inactivity directly creates the conditions that lead to deep vein thrombosis. Among common risk factors, prolonged immobility is the most pervasive way to induce stasis, which is why it’s the strongest factor in this context. Surgery and cancer are important too because they raise clotting tendency and can injure vessels, but without movement the stagnant blood greatly favors clot formation, making inactivity the more influential risk in many scenarios. Age over 60 adds risk, though its effect is incremental compared to the immediate impact of being inactive. In practice, staying active and moving the legs when possible, plus preventive measures during periods of immobilization, are essential to reduce this risk.