Hyperglycemia Without Hyperinsulinemia Produces Both Sympathetic Neural Activation and Vasodilation in Normal Humans

Hyperglycemia Without Hyperinsulinemia Produces Both Sympathetic Neural Activation and... To explore the effects of the acute induction of hyperglycemia on sympathetic activity and vascular function we studied eight normal control subjects (28 ± 3 years of age). Muscle sympathetic nerve activity (MSNA) and forearm vascular resistance (FVR) were measured before (5.4 ± 0.2 mmol/L) and during systemic infusion of 20% dextrose with octreotide (250 μg/h) and low dose insulin (4 mU·m −2 ·min −1 ) with 60 min of hyperglycemia (venous plasma glucose, 12.5 ± 0.6 mmol/L). To control for the effects of hyperosmolarity and volume infusion subjects returned for two control studies with equal volume 20% mannitol and 0.2% saline infusions instead of dextrose infusion. The increase in MSNA during hyperglycemia (178 ± 48 units) was significantly greater than the increase during mannitol (69 ± 46 units, p < 0.001) or during 0.2% saline (28 ± 28 units, p < 0.001). The decreases in FVR after 60 min of hyperglycemia 20 ± 4 units , p = 0.002 and mannitol 13 ± 4 units , p = 0.033 were significantly greater than the decrease during saline (0.1 ± 4 units). The changes in FVR during hyperglycemia and mannitol did not differ. Acute hyperglycemia causes sympathoexcitation and peripheral vasodilation. The vascular effect may be mediated by increased osmolar load. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Diabetes and its Complications Elsevier

Hyperglycemia Without Hyperinsulinemia Produces Both Sympathetic Neural Activation and Vasodilation in Normal Humans

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Publisher
Elsevier
Copyright
Copyright © 1999 Elsevier Science Inc.
ISSN
1056-8727
DOI
10.1016/S1056-8727(98)00019-1
Publisher site
See Article on Publisher Site

Abstract

To explore the effects of the acute induction of hyperglycemia on sympathetic activity and vascular function we studied eight normal control subjects (28 ± 3 years of age). Muscle sympathetic nerve activity (MSNA) and forearm vascular resistance (FVR) were measured before (5.4 ± 0.2 mmol/L) and during systemic infusion of 20% dextrose with octreotide (250 μg/h) and low dose insulin (4 mU·m −2 ·min −1 ) with 60 min of hyperglycemia (venous plasma glucose, 12.5 ± 0.6 mmol/L). To control for the effects of hyperosmolarity and volume infusion subjects returned for two control studies with equal volume 20% mannitol and 0.2% saline infusions instead of dextrose infusion. The increase in MSNA during hyperglycemia (178 ± 48 units) was significantly greater than the increase during mannitol (69 ± 46 units, p < 0.001) or during 0.2% saline (28 ± 28 units, p < 0.001). The decreases in FVR after 60 min of hyperglycemia 20 ± 4 units , p = 0.002 and mannitol 13 ± 4 units , p = 0.033 were significantly greater than the decrease during saline (0.1 ± 4 units). The changes in FVR during hyperglycemia and mannitol did not differ. Acute hyperglycemia causes sympathoexcitation and peripheral vasodilation. The vascular effect may be mediated by increased osmolar load.

Journal

Journal of Diabetes and its ComplicationsElsevier

Published: Jan 1, 1999

References

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