Posture, blood velocity in common femoral vein, and prophylaxis of venous thromboembolism.
cross_sectional · Level IV
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Abstract
Might leg elevation and avoidance of poor postures provide better prophylaxis against venous thromboembolism than heparin or mechanical methods? 12 supine subjects tilted in 3 degrees increments from 6 degrees leg-down to 12 degrees leg-up showed linear increase in mean peak blood velocity and reduction in calibre in the common femoral vein (colour-duplex ultrasound). Between horizontal and 6 degrees leg-up, velocity was increased by 17% and diameter reduced by 14%. A ranking of mean peak velocities in six postures (sitting; standing; trunk raised 35 degrees to legs which were first horizontal and then tilted up 6 degrees; supine, first horizontal then 6 degrees leg-up) showed significant increases in velocity between consecutive positions.