What causes traveller's thrombosis?
Commentary: Dr. Taketoshi Morimoto
(Professor Emeritus, Kyoto Prefectural University of Medicine)
- Dr. Takatoshi Morimoto's title shown in the video is as it was in 2002 when the video was recorded.
Traveller′s thrombosis (economy class syndrome) occurs when the moisture in the body evaporates, causing blood viscosity to rise. This is especially likely in the dry atmosphere and low pressure of an aircraft cabin. Insufficient rehydration, and the consumption of drinks with a diuretic action, such as alcohol, also leads to dehydration and the risk of a rise in blood viscosity.
When the lower legs continue to be put under pressure from prolonged sitting in such conditions, blood thickens, and a blood clot can form; this is called deep-vein thrombosis. If a blood clot becomes detached when you stand up, it travels through the blood stream, and can get stuck in a narrow blood vessel in a lung, which can cause difficulties in breathing and palpitations. This is called a pulmonary embolism.
People particularly at risk of developing traveller′s thrombosis
Factors which can lead to thrombosis formation include; endothelial disorder of the vein (a state in which the blood vessel is injured), hypercoagulability of the blood (a state in which the blood can easily clot), and stagnation of the blood flow of the vein (a state of poor blood flow).
People with the conditions listed below should be extra careful.
Degree of additional risk of developing traveller′s thrombosis posed by various factors
| Risk Level |
Risk Factor |
| Low |
- Obesity
- Estrogen treatment
- Varicose veins in legs
|
| Middle |
- Old age
- Prolonged immobility
- Congestive heart failure
- Respiratory failure
- Malignant disease
- Central venous catheterization
- Cancer chemotherapy
- Severe infectious disease
|
| High |
- Past history of the vein thromboembolism
- Clot-related factor
- Paralysis of lower limbs
- Lower limbs in a cast
|
- Thrombophilic diathesis
- Congenital diathesis could be caused by antithrombin deficiency, protein C deficiency, or protein S deficiency etc. Acquired predispositions could be due to antiphospholipid antibody syndrome etc.
- Source
- Pulmonary thromboembolism / deep vein thrombosis (venous thromboembolism) prevention guideline - abridged version
Preventing Traveller′s Thrombosis
Massage your lower legs
Adequate exercise and massage are effective ways of maintaining normal blood flow and preventing bloods clots, especially when focused on the lower leg and feet.
Elastic stockings can also be used in place of foot massages.
Be sure to drink plenty of fluids
