Dynamic Fractioning of the Gravitational Hydrostatic Pressure: A hemodynamic model for the venous pressure control by the valvo-muscular pump

Dynamic Fractioning of the Gravitational Hydrostatic Pressure (DFGHSP) is a pillar of a hemodynamic model of the venous pathophysiology. It describes how the valvo-muscular pump varies the distal venous pressure in the lower limbs. It results from an inductive reasoning based on clinical signs and instrumental data at rest and during the action of the valvo-muscular pump of the calf. It does not claim to be the final truth, but a new "as if" model that improved the diagnosis and the treatment of the venous insufficiency (CHIVA, French acronym for Cure Conservatrice et Hémodynamique de l’Insuffisance Veineuse en Ambulatoire) according to several randomized studies and meta-analyses. That approach overturns the classic diagnosis and treatment of venous insufficiency because it is conservative and opposes the widely spread destructive based view. It needs a minimal study of basic fluid mechanics which can explain venous hemodynamics, the core of venous pathophysiology. The proposed DFGHSP fluid mechanics model is compared with the hemodynamic clinical and instrumental data in order to assess its pathophysiologic relevance.