Three studies of venous thrombosis after long-haul flights give risk estimates

In the December 8 issue of Annals of Internal Medicine there are three articles on thromboembolism after long-haul flights. In the first German researchers assessed the incidence of venous thrombosis associated with long-haul flights in a prospective, controlled cohort study of 964 passengers returning from long-haul flights (flight duration, 8 hours or more) and 1213 non-traveling control subjects.