Write a short note on VTE Prophylaxis in Surgery.

The Concept

Venous thromboembolism (VTE) prophylaxis means the measures taken to prevent deep vein thrombosis and pulmonary embolism in surgical patients. It is one of the most important routines in surgery because VTE is a major, largely preventable cause of postoperative death, and every surgical patient should be assessed for it.

Risk Assessment

Prophylaxis is guided by a risk assessment weighing the type of surgery (major, pelvic or orthopaedic surgery being high-risk) against patient factors — increasing age, malignancy, immobility, previous VTE, obesity, thrombophilia — and the patient's bleeding risk.

Methods

• Mechanical — graduated compression stockings and intermittent pneumatic compression devices (used for most patients, and especially where drugs are contraindicated).
• Pharmacological — low-molecular-weight heparin (e.g. Enoxaparin) or a DOAC.
• General — early mobilisation and adequate hydration.

The choice balances thrombosis risk against bleeding risk, and prophylaxis may be extended after discharge for high-risk surgery (major cancer or major orthopaedic operations).

Mechanical VS Pharmacological & Balancing Bleeding Risk

The interplay of the two arms of prophylaxis is worth spelling out. Mechanical methods (stockings, intermittent pneumatic compression) carry no bleeding risk and are used when pharmacological prophylaxis is contraindicated (e.g. Active bleeding, or immediately around neurosurgery/spinal anaesthesia). Pharmacological prophylaxis (LMWH) is more effective but must be timed to avoid bleeding around surgery and neuraxial blocks. Combining the two in high-risk patients, while individualising the plan to the bleeding risk, is the essence of good VTE prevention.

The Bottom Line

VTE prophylaxis prevents a major cause of postoperative death by combining risk assessment with mechanical and pharmacological measures and early mobilisation, balanced against bleeding risk.

A Note on Early Mobilisation

Beyond stockings and heparin, the simplest and most universally applicable measure is early mobilisation: getting the patient up and walking soon after surgery activates the calf muscle pump, which promotes venous return and directly counters the stasis limb of Virchow's triad. Combined with adequate hydration (avoiding the haemoconcentration that predisposes to clot), early mobilisation is a cornerstone of VTE prevention that costs nothing, benefits recovery generally, and complements the mechanical and pharmacological methods.

Balance thrombosis risk against bleeding risk for each patient.

• VTE prophylaxis prevents DVT/PE — a major preventable cause of postoperative death; assess every surgical patient.
• Risk assessment: surgery type (major/pelvic/orthopaedic) + patient factors (age, malignancy, immobility, previous VTE, obesity) vs bleeding risk.
• Mechanical (compression stockings, intermittent pneumatic compression) + pharmacological (LMWH/DOAC) + early mobilisation + hydration.
• Balance thrombosis vs bleeding risk; extend prophylaxis after major cancer/orthopaedic surgery.