title: Effect of diltiazem on methacholine-induced bronchoconstriction in extrinsic asthmatics.
abstract: The protective effect of the calcium antagonist diltiazem on methacholine-induced bronchoconstriction was investigated in 19 extrinsic asthmatics. A double-blind cross-over design was used (diltiazem vs. placebo, administered orally for 1 week). We found no significant difference between the two treatment regimens when expressed as the provocation dose of methacholine causing a 20% drop in forced expired volume in 1 s (PD20 FEV1). Some individual patients might nevertheless gain some benefit from diltiazem as an additional treatment in difficult-to-manage asthma.
mesh_terms: D000293:Adolescent; D000328:Adult; D000403:Airway Resistance / Q000187:drug effects; D001249:Asthma / Q000188:drug therapy* / Q000503:physiopathology; D001552:Benzazepines / Q000627:therapeutic use*; D001980:Bronchi / Q000187:drug effects* / Q000503:physiopathology; D002986:Clinical Trials as Topic; D004110:Diltiazem / Q000627:therapeutic use*; D004311:Double-Blind Method; D005260:Female; D005541:Forced Expiratory Volume; D006801:Humans; D008297:Male; D016210:Methacholine Chloride; D008688:Methacholine Compounds / Q000494:pharmacology*; D008875:Middle Aged
chemical_list: D001552:Benzazepines; D008688:Methacholine Compounds; D016210:Methacholine Chloride; D004110:Diltiazem