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Editor's Correspondence
August 9/23, 2004

Venous Thrombosis in Long-Haul Travelers

Arch Intern Med. 2004;164(15):1699-1700. doi:10.1001/archinte.164.15.1699-b

Schwarz et al1 reported that the incidence of venous thrombosis among long-haul flight travelers was 2.8% compared with 1.0% in controls. However, 20 of 27 events in travelers and 10 of 12 events in controls were isolated calf muscle vein thromboses (ICMVT). The authors conclude that ICMVT may be used as a surrogate marker of air travel–associated deep venous thrombosis (DVT) and that while "the natural history of ICMVT is not known . . . ICMVT has been suggested to be the first step toward deep venous thrombosis."

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