WHOLE BLOOD VISCOSITY DETERMINED BY PLASMA PROTEIN, HEMATOCRT, MEAN CORPUSCULAR VOLUME

BACKGROUND: in this study, with a re-evaluation of the hemorheological determinants previously described in MGUS subjects and in MM patients, we have detected the calculated whole blood viscosity, according whether to the hematocrit and total plasma protein concentration (de Simone formula) or to the haematocrit and plasma fibrinogen level (Merrill formula), and a marker of the erythrocyte aggregation (albumin/fibrinogen level). METHODS: data were expressed as means±standard deviation. Student’s t test for unpaired data was used to compare MGUS subjects and MM patients. The correlation coefficient between mean erythrocyte aggregation (MEA) and hematocrit (Ht) was evaluated in MGUS, MM and MGUS + MM groups using the Spearman test. RESULTS: the comparison between MGUS and MM shows that the measured blood viscosity and calculated blood viscosity based on hematocrit and total plasma protein, but not which estimated in relation to the hematocrit and plasma fibrinogen, differentiate the two groups. A difference between the two groups also regards the measured erythrocyte aggregation and its surrogate marker. In addition, the measured plasma viscosity at low shear rate (0.51 s–1) and, in particular, the ratio between plasma viscosity at low (0.51 s–1) and high (450 s–1) shear rates distinguish MGUS and MM. CONCLUSIONS: calculated blood viscosity (de Simone formula and other formulas) and the surrogate marker of erythrocyte aggregation disclose an alike trend with the corresponding hemorheological determinants obtained by using their direct measurement.

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Whole-Blood Viscosity, Hematocrit and Plasma Protein in Normal Subjects at Different Ages

Acta Physiologica Scandinavica ◽

10.1111/j.1748-1716.1971.tb04899.x ◽

1971 ◽

Vol 81 (2) ◽

pp. 264-268 ◽

Cited By ~ 25

Author(s):

J. Ditzel J. Kampmann

Keyword(s):

Plasma Protein ◽

Blood Viscosity ◽

Whole Blood ◽

Normal Subjects ◽

Whole Blood Viscosity ◽

Different Ages

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Viscosity and Red Cell Deformity in Arterial Disease

10.1055/s-0038-1665789 ◽

1979 ◽

Author(s):

G Cella ◽

H de Haas ◽

M Rampling ◽

V Kakkar

Keyword(s):

Vascular Disease ◽

Blood Viscosity ◽

Whole Blood ◽

Arterial Disease ◽

Plasma Viscosity ◽

Control Group ◽

Fibrinogen Concentration ◽

Red Cell ◽

Whole Blood Viscosity ◽

Significant Difference

Haemorrheological factors have been shown to be affected in many kings of vascular disease. The present study was undertaken to correlate these factors in normal subjects and patients suffering from peripheral arterial disease. Twenty-two patients were investigated; they had moderate or severe intermittent claudication, extent of disease being confirmed by aorto-arteriography and ankle-systolic pressure studies. Twenty-five controls with no symptoms or signs of arterial disease were selected with comparable age and sex distribution. Whole blood viscosity was measured at shear rates of 230 secs-1 and 23 secs-lat 37°c using a Wells Brookfield cone plate microvisco meter. Plasma viscosity was also measured in an identical manner. Erythrocyte flexibility was measured by centrifuge technique and fibrinogen concentration as well as haematocrit by standard techniques. The fibrinogen concentration appeared to be the only significant parameter; the mean concentration in patients with peripheral vascular disease of 463 ± 73mg/l00ml in the control group ( < 0.05). Although whole blood viscosity was high in patients, when corrected to a common haematocrit, there was no significant difference between patients and controls. The same megative correlation was found for plasma viscosity. The red cell flexibility was found to be increased in patients as compared to the control group, but this effect appeared to be simply proportional to the fibrinogen concentration.

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