Comparative analysis of chosen hemorheological methods in a group of stroke patients

Abstract

Blood viscosity is one of the most important factors determining the blood flow. In this report we describe changes in whole blood viscosity in a group of patients after stroke measured as a function of the shear rate (flow curve) and also blood visco-elastic properties measured using oscillatory methods (dynamical mechanical analysis). The principle of the latter method is based on the measurement of the amplitude and phase of the sample oscillations driven by controlled harmonic strain. All measurements were performed by means of a rotary-oscillatory rheometer Contraves LS-40.

Cerebral hemodynamics: concepts of clinical importance

“…Although contested by a number of authors, there is increasing evidence that hyperventilation produces cerebral hypoperfusion, decreased cerebral oxygenation, activation of anaerobic cell respiration, and poorer patient outcomes 45 . Furthermore, impaired CO 2 cerebrovascular reactivity reflects loss of microvascular function and can be associated with increased risk of cerebral infarction in patients with carotid occlusive disease 48,49 .…”

“…The dependence of CBF on cardiac output is also seen in cardiac patients, in which decreased cerebral oxygenation during exercise can be noted in cardiac patients with decreased perfusion as a result of compromised cardiac output 77 . In SAH patients, left ventricular dysfunction and low cardiac output increase the risk of cerebral infarction associated with vasospasm 18,49 .…”

Effect of Whole-Body Cryotherapy on Morphological, Rheological and Biochemical Indices of Blood in People with Multiple Sclerosis

“…It concerns both whole blood, plasma, and morphotic elements (especially red blood cells) [39]. The basic factors that influence blood flow are RBC, red blood cell deformability and aggregation, plasma viscosity, and HCT [39][40][41]. The phenomenon of erythrocyte deformability plays an important role in the flow of blood cells through capillaries with a diameter even two times smaller than themselves [42].…”

Effect of whole-body cryotherapy on morphological, rheological, and biochemical blood indices in individuals with multiple sclerosis

“…It concerns whole blood, as well as plasma and morphotic elements, especially red blood cells [31]. The basic factors that in uence blood ow involve RBC, red blood cell deformability and aggregation, plasma viscosity, and HCT [31][32][33].…”

“…The degree of red blood cell aggregation depends on the ow conditions, properties of cell membranes, and physicochemical properties of cells [33]. Small blood vessels, where the shear rates are usually low, are particularly susceptible to the formation of erythrocyte aggregates.…”