[Hemorheological parameters in the prognosis of the risk of fetal retardation in pregnancy with arterial hypertension].

The haemorheological theory creates the notions of the interrelationship between the haemodynamic alterations in the blood flow and the whole-blood viscosity. The whole-blood viscosity is a variable parameter in close relation to the vessel geometry and blood flow rate, the blood plasma viscosity, the volume concentration of the blood cells, mostly of the red blood cells (the haematocrit) as well as to the hydrodynamically effective haemorheological phenomena of the aggregation and deformability of the erythrocytes. In the onward development of pregnancy in Bulgarian women with pre-eclamptic signs an increase of the haematocrit, the haemoglobin concentration and the erythrocyte aggregation were found. These data could be of benefit as reference point of possible risk-conditions for the mother during the pregnancy advance and in the same time of manifestation a retardation and/or stillbirth or neonatal death.