Danger of heart condition is higher among those who travel on long flights
Tuesday, November 6th, 2007A recent study of business travelers shows definitively there is a risk of dangerous blod clots for persons traveling on long flights and frequent flyers who travel for longer periods of time.
Sitting still for long periods can cause a condition called deep vein thrombosis (D.V.T.). The study found that people who fly four hours or more have three times the risk of developing clots compared with periods when they did not travel.
D.V.T. occurs when a blood clot forms within the large deep veins of the body, usually in the leg. President Nixon had this condition during the time he was president. The NBC reporter David Bloom died of this condition during the U.S. invasion of Iraq because he had been standing for several days in a vehicle. In the condition, part of the clot can break off and travel to the lungs and cause a pulmonary embolism, a serious and potentially fatal condition.
The researchers, Frits R. Rosendaal and Suzanne C. Cannegieter of Leiden University Medical Center in the Netherlands, tracked over 8,000 employees of large international organizations over a multi-year period. The results were published in the online journal PLoS Medicine; preliminary findings were reported in late June by the World Health Organization.
“We now know out of 4,500 people who fly, one will get a D.V.T. within eight weeks after travel,” Dr. Cannegieter said. The risk increases with the length and number of a flights in a short period.
Michael G. Reiff, a U.S. executive with Royal Dutch Shell, was hospitalized with D.V.T. after a flight from Houston to Amsterdam. Mr. Reiff, 53, took long flights almost 50 percent of the time and flew first or business class. He has since cut his flying time almost in half and no longer sleeps on planes. “Now I literally walk up and down the aisles.” At work, “I walk the halls every two hours, even at meetings,” Mr. Reiff said.
Rochelle Broome, corporate medical director for primary care at CHD Meridian Healthcare, recommends employees do frequent seat exercises to ensure increased blood circulation. “You don’t have to take a pill. There’s no shot. It’s easy,” said Dr. Broome, who experienced D.V.T.’s herself.
D.V.T. typically includes unexplained pain, tenderness, redness and swelling, often in the leg. Once a clot has traveled to the lung, common symptoms include chest pain and breathing difficulties. Some cases are asymptomatic or mirror other illnesses. For example, leg pain can be mistaken for a strained muscle and chest pain is often misdiagnosed as a heart attack or the flu.
Aspirin, which is effective in preventing heart attacks and strokes, does not lessen the danger of D.V.T. The researchers warned against wearing commercial compression stockings, which are effective only if custom fit; otherwise, they can have a negative effect by blocking blood flow. Also discouraged is the excessive intake of alcohol and use of sleeping pills because they promote immobility.
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