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• W1993215973 abstract "This study compares the potency and efficacy of different relaxant drugs including anticholinergic, β-adrenergic and methylxanthine agents on acetylcholine-contracted feline bronchi, and investigates the influence of the initial muscarinic-induced tone on bronchodilator response. Feline bronchi were removed from euthanased client-owned cats and were contracted with acetylcholine to cause either 40% or 80% of the acetylcholine maximal contraction. The efficacy and potency of bronchodilating drugs were obtained from cumulative dose-response curves with efficacy (E(max)) as the maximal relaxant response and potency (-logEC(50)) as the logarithm of the concentration of drug inducing 50% of maximal relaxation. Under low contractile tone (40%), all bronchodilators relaxed feline bronchi in a concentration-dependent manner with the following rank order of potency: formoterol>ipratropium bromide>fenoterol>isoprenaline>salbutamol≥salmeterol>theophylline. E(max) values ranged from 80% to 100% depending on the tested drug. Constriction of feline bronchi with high-dose acetylcholine (80%) caused a rightward and downward shift of the β(2)-mimetic dose-response curves. Significant decreases in -logEC(50) and E(max) values were reported for salbutamol, formoterol and salmeterol. This study provides evidence that existing classes of bronchodilators produce effective relaxation of acetylcholine-contracted feline bronchi and that airway responsiveness to β(2)-stimulants is dependent on the magnitude of the initial muscarinic-induced tone. The clinical relevance of these in vitro findings has yet to be explored in clinical trials." @default.
• W1993215973 created "2016-06-24" @default.
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• W1993215973 date "2012-07-01" @default.
• W1993215973 modified "2023-09-26" @default.
• W1993215973 title "A comparison of in vitro relaxant responses to ipratropium bromide, β-adrenoceptor agonists and theophylline in feline bronchial smooth muscle" @default.
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• W1993215973 doi "https://doi.org/10.1016/j.tvjl.2011.10.026" @default.
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