ISSN:
1438-8359
Keywords:
Stable asthmatics
;
Calcium channel blockers
;
Methacholine hydrochloride
;
Astograph
;
Respiratory resistance
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract The calcium channel blockers, diltiazem and verapamil, and the beta agonist orciprenaline sulfate all demonstrated significant protection against methacholine-induced bronchoconstriction in 11 stable asthmatics (5 males and 6 females). Ten and 20 mg of inhaled diltiazem, 5 mg of verapamil or 30 mg of orciprenaline administered 15 min before stepwise increasing doses of methacholine hydrochloride produced significant reduction in respiratory resistance (Rrs), minimum dose of methacholine hydrochloride required for Rrs increase (Dmin) and bronchial reactivity measured with an Astograph. The mechanism of action of the calcium channel blockers is presumably at the level of the smooth muscle cells themselves. The combination of positive influence and lack of any adverse effect on blood pressure or heart rate with any of the agents tested indicates that their clinical application for alleviation of acute asthma can be recommended. (Tsuda T, Hatta M, Ishikawa K, et al.: Inhalation of calcium channel blocking agents protects against methacholine-induced bronchoconstriction. J Anesth 7: 397--404, 1993)
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s0054030070397
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