Which of the following is NOT a method to prevent DVT?

Surgical intervention is not a method to prevent deep vein thrombosis (DVT) but is rather a treatment option for cases that have already developed or for those at very high risk. Preventative measures for DVT primarily focus on non-invasive and conservative strategies to improve venous return and decrease the risk of clot formation.

Leg exercises, such as ankle pumps and calf stretches, enhance blood circulation and are recommended for patients who are mobile or are able to perform them. Compression hose are also widely used, as they apply graduated pressure to the legs, helping to prevent venous stasis and enhancing blood flow back to the heart. Elevating the foot of the bed can help in reducing swelling and promoting venous return, thereby also acting as a preventative measure against DVT.

In contrast, surgical intervention might involve procedures like thrombectomy or filtering, which would only be considered after DVT has been diagnosed or in specific cases where other treatments are ineffective or not suitable. Therefore, it does not fall under the preventative measures intended to avert the occurrence of DVT in patients at risk.