In a large study (the MEGA study) of nearly 2000 people with a first thrombosis in the Netherlands, Dr Suzanne Cannegieter and colleagues from the Leiden University Medical Center looked at the risk factors for thrombosis compared with their partners, who did not have thrombosis. The results, published in the international open-access medical journal PLoS Medicine, showed that 233 of the people with thrombosis had traveled for more than 4 h in the 8 weeks preceding the event. Although the overall risk of developing thrombosis is still low, traveling in general was found to increase the risk of venous thrombosis 2-fold. The risk was highest in the first week after traveling, and the overall risk of flying was largely similar to the risks of traveling by car, bus, or train.
In particular groups of people the risk was increased. For example, the risk was up to 8-fold in people who also had a specific mutation in one of the genes involved in clotting (factor V Leiden); almost 10-fold in those who had a body mass index of more than 30 kg/m2; 4-fold in those who were more than 1.90 m tall; and more than 20-fold in those who used oral contraceptives. For air travel these findings of risk in particular groups were more apparent than for other modes of travel, and in addition, people shorter than 1.60 m had an almost 5-fold risk of thrombosis after air travel. However, the numbers of people in each of these groups was small and hence the estimates of risk must be interpreted carefully.
The authors conclude that the risk of venous thrombosis is moderately increased for all these modes of travel, and that in particular groups of people the risk is highly increased. The study could not show the mechanism of the increased risk, although the association of thrombosis with all types of travel, not just air travel, suggests that immobility is a key factor. Other mechanisms, such as reduced oxygen levels triggering clotting, may be involved in the particularly increased risk seen in air travel in some groups.
For those who have an increased risk, such as oral contraceptive users and individuals with factor V Leiden, the authors say that preventative measure such as exercises may be warranted. However, the study’s results apply only to people younger than 70 y of age and it is likely that other characteristics exist that also increase the risk. These characteristics are being investigated in an ongoing study – the World Health Organization Research Initiative into the Global Hazards of Travel (WRIGHT).
Satellites, airport visibility readings shed light on troops' exposure to air pollution
09.12.2016 | Veterans Affairs Research Communications
Oxygen can wake up dormant bacteria for antibiotic attacks
08.12.2016 | Penn State
Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.
Topological insulators are currently the hot topic in physics according to the newspaper Neue Zürcher Zeitung. Only a few weeks ago, their importance was...
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
09.12.2016 | Life Sciences
09.12.2016 | Ecology, The Environment and Conservation
09.12.2016 | Health and Medicine