Fig. 4
From: Femoral vein pulsatility: a simple tool for venous congestion assessment
Proposed Guytonian curve on correlation of VExUS with FVD. This is a modified Guytonian curve as a hypothesis to our findings. The normal Frank starling curve with venous return curve intersecting at ascending portion shows a collapsing IVC (vexus grade 1) correlating with antegrade predominantly monophasic Femoral venous Doppler flow and the lower Frank Starling curve with venous return intersection at flat portion shows pulsatile portal vein correlating with VExUS grade 3 and corresponding pulsatile femoral venous Doppler without respiratory variation.