[Fluid mass distribution during extracorporeal circulation]

The author first recalls close relations existing in physiologic conditions between central venous pressure and blood mass. During E.C.C., this relation is out of truth through the action of venous correlations and of outout. Then studying distribution of blood mass in the different compartments, he notes that during E.C.C., the total organic fluid mass changes a little, but that the extracellular volume increases when the blood mass grows less. To these modifications shares in a seclusion of blood in the visceral compartment.