Clinical Hemorheology and Microcirculation - Volume 8, issue 1

Authors: Ernst, E. | Matrai, A. | Roloff, Ch. | Magyarosy, I. | Andraeo, J.

Article Type: Research Article

Abstract: Fourteen patients suffering from reflex atrophy stage II were investigated for blood rheology. Blood and plasma viscosity, hematocrit, blood cell filterability, red cell aggregation, leukocyte count, serum electrophoresis, erythrocyte sedimentation rate (ESR) and plasma fibrinogen levels were measured. The cross-sectional comparison shows that, compared to matched controls, plasma viscosity, red cell aggregation and ESR were significantly higher, while blood cell filterability and gamma globulin fractions were lower in patients. In a subsequent longitudinal study five patients were studied while receiving hydroelectric treatment. During therapy a progressive normalization of plasma viscosity and blood cell filterability readings, paralleled by clinical improvement could …be observed. It is suggested, that blood rheology is impaired in reflex atrophy stage II, possibly due to an imbalance of autonomous nervous control, and that this hemorheological deficit might contribute to the disruption of the microcirculation in this disease. Show more

Keywords: reflex atrophy, hemorheology, physical therapy, electric current

DOI: 10.3233/CH-1988-8110

Citation: Clinical Hemorheology and Microcirculation, vol. 8, no. 1, pp. 61-66, 1988

Authors: Kilpatrick, D. | Lavercombe, P.S. | Webber, S.D.

Article Type: Research Article

Abstract: To determine whether or not viscosity reduction would improve flow past a significant stenosis in a major artery an in vitro perfusion apparatus with 12 variable sized stenoses was used with whole blood at three different viscosity levels. A 36% reduction of the viscosity of whole blood by the addition of normal saline did not alter either the pressure flow relationships or the resistance to blood flow across any of the 12 stenoses ranging from 50% to 97%. We conclude that although change in viscosity may improve perfusion through the microcirculation it does not alter perfusion across a discrete arterial …stenosis. Show more

Keywords: viscosity reduction, ischaemia, haemodilution, arterial stenoses

DOI: 10.3233/CH-1988-8111

Citation: Clinical Hemorheology and Microcirculation, vol. 8, no. 1, pp. 67-71, 1988

Authors: Rillaerts, E. | Van Camp, G. | Claeys, M. | De Leeuw, I.

Article Type: Research Article

Abstract: Different methodologies and heterogeneous patient groups have led to conflicting results with respect to erythrocyte deformability in diabetes mellitus. Therefore we studied erythrocyte deformability by means of viscosity measurements in insulin dependent diabetics without major vascular complications and its relationship with metabolic control. Viscosity measurements of red cells suspended in a non-aggregating physiological medium were performed with a Contraves Low Shear 30 viscosimeter at low (0.945s−1 ) and high (128.5s−1 ) shear rate. Erythrocyte viscosity in the diabetic group was normal at high shear rate but significantly increased at low shear rate. This increased low shear rate viscosity was observed …only in patients with bad metabolic control. Two important conclusions can be derived from our results: 1) detecting abnormal erythrocyte rheology in diabetes depends upon experimental conditions and 2) in insulin dependent diabetics without vascular complications erythrocyte flow properties depend on the metabolic status. detecting abnormal erythrocyte rheology in diabetes depends upon experimental conditions and in insulin dependent diabetics without vascular complications erythrocyte flow properties depend on the metabolic status. Show more

Keywords: diabetes mellitus, erythrocyte deformability

DOI: 10.3233/CH-1988-8112

Citation: Clinical Hemorheology and Microcirculation, vol. 8, no. 1, pp. 73-80, 1988

Authors: Berling, C. | Lacombe, C. | Lelievre, J.C. | Rouvier, B. | Vasseur, J.P. | de Mazencour, P. | Buffat, J.J.

Article Type: Research Article

Abstract: An assessment of the impact of transfusing blood on the hemorheological data of patients is reported when submitted to vascular or plastic surgery. Autotransfusion and hemodilution are discussed as a challenge to the homologous transfusion. The rheological study is performed with a Couette viscometer. Unsteady flow measurements related to blood thixotropy and measurements in steady state flow conditions related to the shearthinning property of blood are reported. Pre and postoperative results are discussed taking into account the surgical procedure, the intraoperative blood and fluid requirements. The main conclusion of the study is that for the six cases here reported, from …a rheological standpoint, the immediat post-operative state is quite good irrespective of the method of transfusion. Show more

Keywords: Viscometry, blood transfusion, vascular and plastic surgery

DOI: 10.3233/CH-1988-8113

Citation: Clinical Hemorheology and Microcirculation, vol. 8, no. 1, pp. 81-87, 1988

Authors: Ernst, E. | Peter, S. | Matrai, A. | Kollar, L.

Article Type: Research Article

Abstract: A 54 year old man presented with typical claudication due to occluded superficial femoral arteries of both legs. On the right side there was a short occlusion without visible col laterals in the angiogram. On the left side there was a long occlusion with numerous narrow col laterals. Before hemodilution the walking distance was limited by ischemic pain in the left leg. After hemodilution walking distance increased but was then limited by pain in the right leg. It is concluded that the different hemodynamic situations respond differently to hemodilution. Possibly this form of treatment is effective …only when average shear stresses are low in the flow limiting segment. Show more

Keywords: peripheral vascular disease, hemodilution

DOI: 10.3233/CH-1988-8114

Citation: Clinical Hemorheology and Microcirculation, vol. 8, no. 1, pp. 89-92, 1988

Authors: Käßer, U. | Heimburg, P.

Article Type: Research Article

Abstract: In order to determine accuracy and precision of the oscillatory capillary rheometer (OCR-D), two Newtonian (water, ethyleneglycol) fluids and a Non-Newtonian (aqueous solution of polyacrylamides) fluid were used. In addition, the ranges of normal and pathological plasma viscosity (1.07–4.61 mPas) and of whole blood viscoelasticity (2.94–12.32 mPas for the viscous and 0–6.46 mPas for the elastic component) were determined in order to select the ranges of viscoelastic parameters for control materials of clinical interest. Mixtures of water and ethyleneglycol were examined to prove their suitability as control samples for plasma viscosity: mixtures in a ratio of 1 to 0.5 and …1 to 4 (v/v) are recommended. To control the measurement of viscoelastic parameters of whole blood, the Non-Newtonian fluid (PAA) and a commercially available red blood cell test suspension (Dia-HT2) were investigated for their precision parameters. For quality control of the viscous component both solutions are required, whereas PAA may also serve for control of the elastic component, Dia-HT2 is not appropriate due to very low elastic responses. Show more

Keywords: blood viscoelasticity, plasma viscosity, quality control, oscillatory capillary rheometer

DOI: 10.3233/CH-1988-8115

Citation: Clinical Hemorheology and Microcirculation, vol. 8, no. 1, pp. 93-103, 1988

Authors: Stuart, J. | Stone, P.C.W. | Bilto, Y.Y.

Article Type: Research Article

Abstract: Valinomycin, a K+ ionophore, was used in vitro to induce loss of K+ and water from the erythrocytes of 20 patients with homozygous sickle cell anaemia. The resulting loss of filterability, through pores of 5 µm diameter, of these dehydrated sickle cells was significantly improved by the presence of oxpentifylline (1.0 and 10 µmol/l), cetiedil citrate (0.1 and 1.0 µmol/l), or the two drugs in combination (each at 0.1 and 1.0 µmol/l). Thus pharmacological concentrations of these drugs, which act by altering cation flux across erythrocyte membranes, can improve the hydration and deformability of sickle cells.

Keywords: Rheology, Erythrocyte deformability, Ion transport

DOI: 10.3233/CH-1988-8116

Citation: Clinical Hemorheology and Microcirculation, vol. 8, no. 1, pp. 105-112, 1988

Authors: Wysocki, M. | Grajek, S. | Bagge, U. | Andersson, O.K. | Braide, M. | Jasinski, K. | Paradowski, S. | Roberts, D.

Article Type: Research Article

Abstract: Central hemodynamics and rheological properties of blood were studied in 15 healthy controls and 28 primary hypertensive patients (WHO 1–2) of both sexes. Hemorheological parameters: whole blood viscosity (η B ), plasma viscosity (η p ), hematocrit (HCT) and red blood cell filterability index (FI) were measured in venous blood sampled just prior to hemodynamic investigation. Plasma volume, systolic and diastolic blood pressure and cardiac output were estimated and indices: plasma volume index (PVI), blood volume index (BVI), cardiac index (CI), stroke volume index (SVI), total peripheral resistance index (TPRI) and aortic rigidity index (ARI) were calculated.

Keywords: hypertension, hemodynamics, hemorheology, blood viscosity, red blood cell deformability

DOI: 10.3233/CH-1988-8117

Citation: Clinical Hemorheology and Microcirculation, vol. 8, no. 1, pp. 113-127, 1988

Authors: Ernst, E.

Article Type: Other

DOI: 10.3233/CH-1988-8118

Citation: Clinical Hemorheology and Microcirculation, vol. 8, no. 1, pp. 129-134, 1988

Article Type: Other

DOI: 10.3233/CH-1988-8119

Citation: Clinical Hemorheology and Microcirculation, vol. 8, no. 1, pp. 135-136, 1988