Claude Franceschi then tried to analyze more exactly the hemodynamic meaning of the Doppler signal wave from normal and diseased vessels.

[3] Franceschi's major work was to match the principles of fluid mechanics[4] with arterial and venous hemodynamics.

Furthermore, destroying varices in impeding the natural drainage of the skin, would be responsible for relapses by a compensation effect (vicarious shunts).

It merely consists in the accurate splitting of the gravitational hydrostatic pressure of the venous column and in the disconnection of closed shunts (depending on the particular configuration of each patient).

[16] Several randomized controlled trials and a Cochrane Library review have demonstrated CHIVA superiority in certain specific anatomical situations to conventional removal (stripping) of the saphenous vein.