, Volume 17, Issue 2, pp 106-111,
Open Access This content is freely available online to anyone, anywhere at any time.
Date: 07 Mar 2007

Leg blood flow measurements using venous occlusion plethysmography during head-up tilt


We tested whether venous occlusion plethysmography (VOP) is an appropriate method to measure calf blood flow (CBF) during head-up tilt (HUT). CBF measured with VOP was compared with superficial femoral artery blood flow as measured by Doppler ultrasound during incremental tilt angles. Measurements of both methods correlated well (r = 0.86). Reproducibility of VOP was fair in supine position and 30° HUT (CV: 11%–15%). This indicates that VOP is an applicable tool to measure leg blood flow during HUT, especially up to 30° HUT.