Search PubMed⌕ Search

Biomedical subjects

A A Shakhnazarov

Publications and source records attributed to A A Shakhnazarov.

At least 19 recordsLinked to original sources
PubMed2005

[A drop in "apparent" blood viscosity due to administration of high-molecular polymer capable of augmenting viscosity].

Influence of a high-molecular compound capable of augmenting viscosity, namely: polyethylene oxide Polyox WSR-301, on hemodynamic parameters in rat mesenteric microvessels was investigated. A substantial decrease in the arteriolar hemodynamic resistance caused by the polymer was revealed. Special research has shown that this reaction is not connected with a vasodilatation and, therefore, is caused by a reduction in the "apparent" viscosity of the blood, i.e., it is a consequence of changed properties of the blood flow.

Animals↗
PubMed1998

[Influence of polyethylene oxide Polyox WSR-301 on the pressure in mesenteric arterial microvessels in rats pre-adapted to anti-orthostatic states].

High-molecular polymers apt to directly influence flow microstructure were tested as a fundamentally new method for correcting microhemodynamics in microgravity. Pressure in the mesenteric arterial microvessels was measured two weeks in rats adapted to the head-down suspension. Intravenous polyethylene oxide (Polyox WSR-301, end-concentration in the order of 2.10(-7) g/ml), reduced the microvascular pressure by 26%, whereas in the control pressure was reduced by only 15%. Systemic arterial pressure showed an equal drop in the groups (by 10 to 11%). These results suggest that the biomechanical agent weakens resistance to the blood flow in the body region where blood supply is impaired by microgravity.

Adaptation, Psychological↗
PubMed1993

[A decrease in the hydrodynamic resistance in the mesenteric arterioles of rats injected with the polyethylene oxide Polyox WSR-301].

The infusion of polyethylene oxide in anesthetised rats in a total dose of 10(-7) g/ml caused a 10-16% reduction in blood pressure. This injection has been associated with 17% decreased pressure (servo-nulling method) and 54% increased blood velocity (laser Doppler fluxmetry) in mesenteric arterioles (d - about 24 mu), but no increase in their internal diameter was observed (image-split method). Vasodilatation (adenosine, 10(-5) M) did not change the hemodynamic response of the arterioles to polymer infusion. These results suggest that microdisturbances of blood flow which can be diminished by drug-reducing polymers are more important for the vascular resistance to blood than it has been previously.

Animals↗