Acute effects of oral glibenclamide on blood pressure and forearm vascular resistance in diabetics.

Abstract:

:1. To determine the effects of an acute oral dose of glibenclamide on blood pressure (BP), basal forearm vascular resistance (FVR) and FVR responses to the K+(ATP) channel activating vasodilator diazoxide, a placebo-controlled, double-blind cross-over study was performed in eight male volunteers with non-insulin-dependent diabetes mellitus. 2. Changes in vascular responses to progressively increasing concentrations of diazoxide (3.75-30 mg/kg per min) and noradrenaline (25-100 ng/kg per min) were measured by venous occlusion plethysmography. 3. Glibenclamide significantly lowered plasma glucose levels compared with placebo (P < 0.02) and attenuated the decrease in FVR (P < 0.05) and the decrease in systolic BP (P < 0.05) that followed a meal. However, vasodilator responses to diazoxide were potentiated by the administration of oral glibenclamide (P < 0.01). 4. Acute administration of oral glibenclamide attenuates the normal decrease in FVR and systolic BP that follows a meal and potentiates rather than inhibits forearm vasodilator responses to intra-arterial diazoxide, probably via indirect humoral effects. These results suggest that glibenclamide has direct or indirect vasoconstrictor effects that antagonize the normal increase in forearm blood flow that follows a meal and that the inhibition of vascular K+(ATP) channels following acute oral glibenclamide administration is clinically insignificant compared with other indirect vascular effects of the drug.

authors

Sundaresan P,Lykos D,Daher A,Morris R,Diamond T,Howes LG

doi

10.1111/j.1440-1681.1998.tb02199.x

subject

Has Abstract

pub_date

1998-02-01 00:00:00

pages

170-4

issue

2

eissn

0305-1870

issn

1440-1681

journal_volume

25

pub_type

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