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PubMed1998

[Tumor diseases of the blood system: age, cholesterol level and erythrocyte count].

AIM: Illustration of potentialities of computer technologies in processing data from case histories MATERIALS AND METHODS: Routine clinical and laboratory data on 263 hemoblastosis patients were processed with the use of the exploring system. RESULTS: A paradoxical negative relationship was discovered between blood cholesterol and age (R = -0.345, p < 0.00001), and a positive correlation between cholesterol and number of red cells (R = 0.379, p < 0.00001). In comparison of groups with low and high cholesterol, the latter group showed more favourable values of hemoglobin, red cells, other hematological and biochemical parameters. It seems that among hemoblastosis patients and healthy subjects there are subjects with standard age-related changes of cholesterol and paradoxical changes (a negative correlation). The conception about high level of cholesterol as a factor stimulating proliferation of normal and affected cells in patients with hemoblastoses appears doubtful. At least it is not correct to connect a combination hypocholesterolemia + anemia with low pool of dividing cells. On the contrary, hypocholesterolemia in hemoblastoses indicates active tumor process with consequent anemia. CONCLUSION: Investigation of paradoxical relationships between age, cholesterol and red cell count (hemoglobin) will help understand general mechanisms of regulation of hemo- and immunogenesis in blood malignancies.

Adult↗
PubMed2006

Erythrocytes and the regulation of human skeletal muscle blood flow and oxygen delivery: role of erythrocyte count and oxygenation state of haemoglobin.

Blood flow to dynamically contracting myocytes is regulated to match O(2) delivery to metabolic demand. The red blood cell (RBC) itself functions as an O(2) sensor, contributing to the control of O(2) delivery by releasing the vasodilators ATP and S-nitrosohaemoglobin with the offloading of O(2) from the haemoglobin molecule. Whether RBC number is sensed remains unknown. To investigate the role of RBC number, in isolation and in combination with alterations in blood oxygenation, on muscle and systemic perfusion, we measured local and central haemodynamics during one-legged knee-extensor exercise ( approximately 50% peak power) in 10 healthy males under conditions of normocythaemia (control), anaemia, anaemia + plasma volume expansion (PVX), anaemia + PVX + hypoxia, polycythaemia, polycythaemia + hyperoxia and polycythaemia + hypoxia, which changed either RBC count alone or both RBC count and oxyhaemoglobin. Leg blood flow (LBF), cardiac output (Q) and vascular conductance did not change with either anaemia or polycythaemia alone. However, LBF increased with anaemia + PVX (28 +/- 4%) and anaemia + PVX + hypoxia (46 +/- 6%) and decreased with polycythaemia + hyperoxia (18 +/- 5%). LBF and Q with anaemia + PVX + hypoxia (8.0 +/- 0.5 and 15.8 +/- 0.7 l min(-1), respectively) equalled those during maximal knee-extensor exercise. Collectively, LBF and vascular conductance were intimately related to leg arterial-venous (a-v) O(2) difference (r(2)= 0.89-0.93; P < 0.001), suggesting a pivotal role of blood O(2) gradients in muscle microcirculatory control. The systemic circulation accommodated to the changes in muscle perfusion. Our results indicate that, when coping with severe haematological challenges, local regulation of skeletal muscle blood flow and O(2) delivery primarily senses alterations in the oxygenation state of haemoglobin and, to a lesser extent, alterations in the number of RBCs and haemoglobin molecules.

Adaptation, Physiological↗
PubMed1987

New parameters in erythrocyte counting. Value of histograms.

In this report we rate a new, third-generation automated hematology system (Technicon Instruments H-1) that can furnish a full range of values, including erythrocyte parameters and a leukocyte differential count. Particular attention is focused on erythrocyte morphometric parameters, including measurement of cell size and hemoglobin content on a cell-by-cell basis. We assess the usefulness of new parameters derived from these measurements, such as mean corpuscular volume and red blood cell distribution width, which characterize cell size, and mean corpuscular hemoglobin concentration, and hemoglobin distribution width, which characterize cell hemoglobinization in evaluating normal and abnormal subjects. The value of these parameters in classifying anemias is assessed in our patient population that includes those with iron deficiency anemias and thalassemias, as well as other forms of anemia.

Anemia↗