Effects of GABA-B agonist baclofen on bronchial hyperreactivity to inhaled histamine in subjects with cervical spinal cord injury.

Abstract:

:Bronchial provocation studies performed in our research center have consistently demonstrated airway hyperresponsiveness to both inhaled methacholine and histamine in subjects with chronic cervical spinal cord injury (SCI). More recently, we reported that the airways of such subjects maintained on chronic baclofen (gamma-aminobutyric acid) therapy were not hyperreactive to inhaled methacholine. In this study we determined whether baclofen also blocks the effects of the bronchoprovocative agent histamine in subjects with cervical SCI. Twenty-four male subjects with cervical SCI participated in this study; 14 were maintained on oral baclofen, and 10 served as age-matched controls. The subjects were challenged with increasing concentrations of aerosolized histamine until either a 20% fall in forced expiratory volume in 1 s (FEV1) from baseline (defined as PC20) was observed, or a maximum of 25 mg/ml histamine was administered. We found that 11 of the 14 baclofen subjects (78.5%) and 8 of the 10 control subjects (80%) responded (PC20 < 8 mg/ml) to the histamine challenge. Mean PC20 values among responders in the baclofen (PC20 = 2.91 +/- 2.3) and control (PC20 = 2.18 +/- 1.9) groups did not differ significantly. Because histamine acts directly on histamine receptors and indirectly on cholinergic pathways, our findings that baclofen blocks bronchoconstriction due to inhaled methacholine, but not that due to histamine, suggests that hyperresponsiveness in subjects with cervical SCI may be secondary to nonspecific airway hyperreactivity.

journal_name

Lung

journal_title

Lung

authors

Grimm DR,DeLuca RV,Lesser M,Bauman WA,Almenoff PL

doi

10.1007/pl00007579

subject

Has Abstract

pub_date

1997-01-01 00:00:00

pages

333-41

issue

5

eissn

0341-2040

issn

1432-1750

journal_volume

175

pub_type

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