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Updated: May 25, 2026

Hyperglycemic Clamp and Hypoglycemic Clamp in Conscious Mice
Published on: January 26, 2024
Acute hyperglycemia does not impair microvascular reactivity and endothelial function during hyperinsulinemic
Eva Horová1, Jiří Mazoch, Jiřina Hiigertová
13rd Department of Internal Medicine, 1st Faculty of Medicine, Charles University, U Nemocnice 1, 12800 Prague, Czech Republic.
Aims:
The aim of this study was to evaluate the effect of acute glycemia increase on microvasculature and endothelium in Type 1 diabetes during hyperinsulinemic clamp.
Patients And Methods:
Sixteen patients (51 ± 7 yrs) without complications were examined during iso- and hyperglycemic clamp (glucose increase 5.5 mmol·L(-1)). Insulin, lipid parameters, cell adhesion molecules and fibrinogen were analyzed. Microvascular reactivity (MVR) was measured by laser Doppler flowmetry.
Results:
Maximum perfusion and the velocity of perfusion increase during PORH were higher in hyperglycemia compared to baseline (47 ± 16 versus 40 ± 16 PU, P < 0.01, and 10.4 ± 16.5 versus 2.6 ± 1.5 PU·s(-1), P < 0.05, resp.). Time to the maximum perfusion during TH was shorter and velocity of perfusion increase during TH higher at hyperglycemia compared to isoglycemic phase (69 ± 15 versus 77 ± 16 s, P < 0.05, and 1.4 ± 0.8 versus 1.2 ± 0.7 PU·s(-1), P < 0.05, resp.). An inverse relationship was found between insulinemia and the time to maximum perfusion during PORH (r = -0.70, P = 0.007).
Conclusion:
Acute glycemia did not impair microvascular reactivity in this clamp study in Type 1 diabetic patients. Our results suggest that insulin may play a significant role in the regulation of microvascular perfusion in patients with Type 1 diabetes through its vasodilation effect and can counteract the effect of acute glucose fluctuations.
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