Venous stagnation induced by 7 days in HDT, in the cerebral, ophthalmic, renal and splanchnic territories.

The scientific objectives was to quantify the vascular changes in the brain, eye fundus, renal parenchyma, and splanchnic network. Heart, portal, jugular, femoral veins were investigate by Echography. The cerebral mesenteric, renal and ophthalmic arteries were investigated by Doppler. Eye fundus vein an papilla were investigated by optical video eye fundus. The left ventricle volume decreased as usual in HDT. The cerebral and ophthalmic vascular resistances didn't change whereas the eye fundus papilla and vein, and the jugular vein increased. These arterial and venous data confirm the existence of cephalic venous blood stasis without sign of intracranial hypertension. On the other hand the kidney volume increased which is in agreement with blood flow stagnation at this level. At last the mesenteric vascular resistance decreased and the portal vein section increased in HDT which is in favor of an increase in flow and flow volume through the splanchnic area.