The first through third Long Flights Thrombosis (LONFLIT) studies showed an incidence of DVT after long-haul flights of 4% to 6%.
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Factors that contribute to the increased risk of travel-related DVT include obesity, extremes of height, use of oral contraceptives and pre-existing blood clotting abnormalities. The absolute risk of DVT in healthy passengers per long-haul flight (more than 4 hours) was found to be about 1 in 6000.
DVT or PE may manifest during or shortly after the flight, but often not for several weeks. Prevention includes choosing aisle seating, maintaining hydration, walking frequently, wearing loose clothing, exercising the lower extremities, using a foot rest, and avoiding alcohol and sleeping pills.
Talk to your doctor about wearing compression stockings or taking medicine before departure if you have additional risk factors for blood clots. Taking aspirin to prevent blood clots when traveling is not recommended.
The following are the most common symptoms of DVT that occur in the affected part of the body (usually the leg or arm): Swelling of your leg or arm. Pain or tenderness that you can't explain. Skin that is warm to the touch.
“Although long distance air travel increases the risk of DVT, the risk is still low. Patients who are at higher baseline risk for DVT or PE should wear compression stockings to reduce their risk of DVT, especially for long flights,” said Dr.
Traveling longer than 8 hours, whether by plane, car, bus, or train, can increase risks for life-threatening blood clot. The risk of a blood clot is about 3-times higher for people traveling on long-distance flights.
Symptoms of DVT may be silent or present as a deep pain in one calf or thigh (with swelling). PE may also be silent but symptoms may include sharp chest pain, breathlessness, bloody sputum, and cardiac collapse in some cases. DVT or PE may manifest during or shortly after the flight, but often not for several weeks.