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Mayo Clinic Proceedings studies risk factors for blood clots

ROCHESTER, Minn. -- The prolonged immobility of flight passengers during long-haul air travel increases the risk of developing blood clots, which could prove fatal especially to people whose travel occurs just prior to major surgery, medical researchers report in the current issue of Mayo Clinic Proceedings.

"At medical institutions where patients are traveling a great distance for surgery, physicians should consider it as an additional risk factor for postoperative blood clots in the veins," says Juraj Sprung, M.D., Ph.D., a Mayo Clinic researcher in the Department of Anesthesiology at Mayo Clinic in Rochester. The study was conducted by Dr. Sprung and others.

Dr. Sprung advises that physicians consider taking extra preventive measures with the patient during the flight and during and after the surgery.

The risk of blood clots prior to surgery and after surgery is explored in several articles in the current issue of Mayo Clinic Proceedings, providing patients and clinicians with valuable advice to consider.

Dr. Sprung says that the study was prompted after a 37-year-old man, who had traveled about 4,800 miles in a transatlantic flight before surgery, died from a pulmonary embolism after the surgery.

The formation of a blood clot within one of the large, deep veins of the pelvis or lower limbs, often in the deep veins of the calf, thigh, knee or pelvis, is referred to as deep vein thrombosis (DVT). A pulmonary embolism can form when the blood clot breaks into smaller pieces, floats in the blood and becomes lodged in the blood vessels supplying the lungs, which may result in sudden death.

Dr. Sprung and colleagues analyzed patient information at Mayo Clinic and found that of 181,765 patients who underwent operations between 1998 and 2002, a total of 3,736 lived outside of the United States, Canada and Mexico and traveled on average more than 5,000 miles prior to surgery. These long-haul travelers experienced over
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31-May-2005


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