Which of the following is NOT a cause of DVT?

Deep vein thrombosis (DVT) occurs when a blood clot forms in a deep vein, typically in the legs. The causes of DVT can be categorized into several factors, such as trauma, conditions leading to hypercoagulability, and extrinsic factors that compress veins.

Trauma can lead to DVT by causing injury to blood vessels, which can activate the body's clotting mechanisms and lead to thrombosis. Hypercoagulability refers to conditions where blood has an increased tendency to clot, due to various factors such as genetic predispositions, certain diseases, or hormonal influences. Extrinsic compression on deep veins can occur due to tumors, swelling, or other external pressure, which can impede normal blood flow and promote clot formation.

In contrast, systemic hypertension is generally a chronic condition characterized by consistently high blood pressure, but it does not directly lead to the formation of blood clots in the veins. While hypertension can affect vascular health, it is not recognized as a direct risk factor for DVT in the same manner as the other options. Thus, it does not belong in the list of causes for DVT.