Special to DG News ATLANTA, GA — May 23, 2002 —
Long distance air travel may cause venous thromboembolism (VTE) in low to moderate risk air travelers, and the usual methods used to prevent it do little to thwart it.
The findings from a New Zealand-based study were presented at ATS 2002, the American Thoracic Society’s 98th International Conference.
Nine hundred and sixteen subjects, recruited from two large metropolitan centers in New Zealand, took part in this study.
All traveled more than four hours in all classes of travel by aircraft and were between ages 18 and 70. Other subjects with known high risk of VTE were excluded. Prior to departure, the subjects completed a detailed questionnaire addressing potential risk factors, and a Serial D-dimer assay was performed prior to and after travel.
Subjects who became positive, or developed symptoms, underwent doppler ultrasonography and Computed Tomography Pulmonary Angiography. Assessment of suspected risk factors, in-flight behaviour, prophylactic measures and common thrombophilias was also investigated.
There were 88 (9.6 percent) subjects who underwent scanning, and 11 (1.2 percent) had definite VTE, (five pulmonary emboli, six deep vein thrombosis). Only one person who developed VTE had used prophylaxis, and none had major risk factors. The mean duration
of return travel in sufferers was 16.8 hours.
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