title: The effect of blood glucose levels on hemorheological parameters, platelet activation and aggregation in oral glucose tolerance tests.
abstract: Rheological factors and increased platelet aggregation are convincingly implicated in the development of micro- and macrovascular disease associated with diabetes mellitus. The present examination has been designed to describe the effects of a standard oral glucose load on hemorheological parameters, platelet activation and aggregation in patients with normal and pathologic glucose tolerance. Oral glucose tolerance test (OGTT) was performed in 30 patients suspected to have diabetes mellitus. Hematocrit, erythrocyte aggregation, red blood cell filterability, plasma and whole blood viscosity, soluble P-selectin levels and platelet aggregation were tested paralelly with blood glucose measurements 1, 2, and 3 hours after glucose consumption. Patients were divided into two groups based on glucose tolerance. Patients with abnormal glucose tolerance (IGT/DM) showed significant elevation in red blood cell aggregability (Myrenne indices M and M1) at the 2- and 3-hour samplings (p<0.01 and p<0.001, respectively). Patients with normal glucose tolerance (NGT) showed significant elevation only in M1 index (p=0.01). Plasma viscosity decreased significantly compared to fasting values in IGT/DM patients in all samples, but remained unchanged in NGT patients. Hematocrit decreased in IGT/DM patients significantly from the 2-hour samplings on (p<0.05), in normoglycaemic patients its decrease reached a borderline significance at 3-hour measurements. No significant changes were detected in whole blood viscosity, red blood cell filterability and sP-selectin levels during OGTT in either examined groups. No examined parameters were significantly correlated to blood glucose levels at any sampling. Erythrocyte aggregation showed significant correlation with BMI (p<0.01). Our results demonstrate that after the intake of a standard amount of glucose the development of rheological alterations is not simultaneous with the elevation of blood glucose levels, and our data suggest that the observed elevation in erythrocyte aggregation during OGTT might be associated with hyperinsulinemia.
authors.affiliation: 1st Department of Medicine, University of Pecs, School of Medicine, Hungary.
authors.forename: Katalin
authors.initials: K
authors.lastname: Koltai
authors.forename: Gergely
authors.initials: G
authors.lastname: Feher
authors.forename: Gabor
authors.initials: G
authors.lastname: Kesmarky
authors.forename: Zsuzsa
authors.initials: Z
authors.lastname: Keszthelyi
authors.forename: Laszlo
authors.initials: L
authors.lastname: Czopf
authors.forename: Kalman
authors.initials: K
authors.lastname: Toth
mesh_terms: D000368:Aged; D001786:Blood Glucose / Q000737:chemistry / Q000502:physiology*; D001809:Blood Viscosity / Q000187:drug effects; D048909:Diabetes Complications / Q000503:physiopathology; D003920:Diabetes Mellitus / Q000175:diagnosis; D004903:Erythrocyte Aggregation / Q000187:drug effects; D004907:Erythrocyte Deformability / Q000187:drug effects; D005260:Female; D005947:Glucose / Q000494:pharmacology*; D005951:Glucose Tolerance Test; D018056:Hemorheology / Q000379:methods; D006801:Humans; D006946:Hyperinsulinism / Q000150:complications; D008297:Male; D008875:Middle Aged; D015539:Platelet Activation / Q000187:drug effects*; D010974:Platelet Aggregation / Q000187:drug effects*
chemical_list: D001786:Blood Glucose; D005947:Glucose