Blood Clots After Surgery: A Silent but Serious Threat

Deep vein thrombosis (DVT) and pulmonary embolism (PE) are among the most dangerous complications following surgery. A blood clot that forms in the deep veins of the leg can break free and travel to the lungs, causing a potentially fatal pulmonary embolism. The risk is highest in the first 2-5 days after surgery but can persist for weeks. At Surgery Dubai, we implement comprehensive venous thromboembolism (VTE) prevention protocols for every surgical patient, tailored to their individual risk profile.

Understanding DVT and Pulmonary Embolism

DVT occurs when blood clots form in the deep veins, most commonly in the calf or thigh. Symptoms include leg swelling (often unilateral), pain or tenderness in the calf or thigh, warmth and redness over the affected area, and pain that worsens when walking or standing. A pulmonary embolism happens when a clot breaks free and lodges in the pulmonary arteries. PE symptoms include sudden shortness of breath, chest pain that worsens with deep breathing, rapid heart rate, coughing up blood, and feeling faint or collapsing. PE is a medical emergency requiring immediate treatment.

Why Surgery Increases Clot Risk

Surgery activates the body’s clotting system through multiple mechanisms: tissue damage releases clotting factors, immobility during and after surgery slows blood flow in the legs, and inflammation thickens the blood. Together, these create what is known as Virchow’s triad—the three factors that promote clot formation: blood stasis, vessel injury, and hypercoagulability. Major abdominal surgery, orthopedic procedures, and cancer operations carry the highest VTE risk.

Assessing Your Individual Risk

At Surgery Dubai, we assess every patient’s VTE risk using validated scoring systems. Risk factors include:

• Patient factors: age over 60, obesity (BMI >30), previous DVT or PE, active cancer, hormone therapy or oral contraceptives, pregnancy, varicose veins, inherited clotting disorders
• Surgical factors: procedure duration over 60 minutes, general anesthesia, pelvic or lower extremity surgery, laparoscopic procedures (increased abdominal pressure reduces leg venous return)
• Post-operative factors: prolonged bed rest, dehydration, infection

Based on this assessment, patients are categorized as low, moderate, or high risk, and prevention measures are prescribed accordingly.

Prevention Strategies We Use

Mechanical Prevention

• Graduated compression stockings — worn from admission until full mobilization, these apply consistent pressure that promotes venous return
• Intermittent pneumatic compression devices — inflatable sleeves wrapped around the legs during and after surgery that periodically squeeze the calves, mimicking the muscle pump action of walking
• Early mobilization — the single most effective prevention measure. Patients at Surgery Dubai are encouraged to walk within hours of surgery whenever possible

Pharmacological Prevention

• Low molecular weight heparin (LMWH) — the standard prophylactic agent, given by subcutaneous injection once or twice daily. Common options include enoxaparin and dalteparin
• Direct oral anticoagulants (DOACs) — rivaroxaban and apixaban are increasingly used for high-risk patients, particularly after orthopedic surgery
• Unfractionated heparin — reserved for patients with kidney impairment who cannot safely receive LMWH

The duration of prophylaxis varies: standard-risk patients receive it during their hospital stay only, while high-risk patients may continue injections at home for 2-4 weeks after discharge.

What You Can Do to Reduce Your Risk

• Walk as soon and as often as your surgeon allows—even short, frequent walks around your room help
• Perform ankle exercises while in bed: flex and point your feet, and make circles with your ankles, 10 times every hour while awake
• Stay well hydrated—drink at least 2 liters of water daily unless instructed otherwise
• Wear your compression stockings as directed, including at night if instructed
• Administer your prescribed blood-thinning injections on schedule—our nurses will teach you or a family member before discharge
• Avoid crossing your legs while sitting, as this restricts blood flow
• Do not sit for extended periods—get up and move every 1-2 hours

When to Seek Emergency Care

Go to the nearest emergency department immediately if you experience sudden shortness of breath, chest pain, leg swelling that is new or worsening, or coughing up blood. Time is critical with blood clots—early treatment dramatically reduces the risk of serious complications. After hours, call the emergency number provided in your discharge instructions from Surgery Dubai.

Long-Term Considerations

Patients who have experienced a DVT or PE are at increased risk for future clots and may require extended anticoagulation. If you have a personal or family history of blood clots, inform your surgeon before any planned procedure so that enhanced prevention measures can be implemented. Contact Surgery Dubai for a pre-operative consultation to discuss your VTE risk and prevention plan.