Validation of the novel venous drainage index with stepwise increases in thigh compression pressure in the quantification of venous obstruction

The VDI is a novel APG parameter derived from a dependency to elevation maneuver that represents the gravitational venous drainage rate of the leg. The DRV is the undrained venous volume caused by the obstruction from an inflated thigh cuff. Both parameters have been demonstrated to respond to and to correlate with increasing venous obstruction pressures. Their potential clinical value in assessing the hemodynamic significance of an iliac or femoral stenosis and in the screening and selection of patients requiring iliac stenting and follow-up requires further investigation.