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. 1994 Dec;49(12):1228–1230. doi: 10.1136/thx.49.12.1228

Comparison of terbutaline and placebo from a pressurised metered dose inhaler and a dry powder inhaler in a subgroup of patients with asthma.

O Selroos 1, A B Löfroos 1, A Pietinalho 1, H Riska 1
PMCID: PMC475329  PMID: 7878558

Abstract

BACKGROUND--Reversibility after administration of an inhaled bronchodilator is not always demonstrable in patients with asthma. Bronchodilator aerosol-induced bronchoconstriction has also been reported to occur in some patients. METHODS--Fifteen selected patients showing < 10% improvement in forced expiratory volume in one second (FEV1) when tested with four doses of salbutamol (0.1 mg/dose) or terbutaline (0.25 mg/dose) from a pressurised metered dose inhaler (MDI) participated in two randomised, double blind studies. They received 2.0 mg terbutaline (4 x 2 doses of 0.25 mg) or a corresponding placebo from an MDI connected to a 750 ml spacer, and 1.0 mg (2 x 0.5 mg) terbutaline or placebo from a multidose dry powder inhaler free of additives (Turbohaler). RESULTS--Inhalation of placebo MDI resulted in a mean (SD) decrease in FEV1 of 20.5 (14.1)% (range -42.9% to +2.6%). In 14 patients inhalation of 2.0 mg terbutaline MDI with spacer resulted in < 10% improvement (mean increase 3.1 (6.0)%). One mg of terbutaline via a Turbohaler resulted in improvements in FEV1 of > 15% in eight patients (mean increase 16.0 (9.7)%). The improvement was < 10% in four patients. Use of placebo Turbohaler did not affect airway calibre (mean change 0.2 (2.9)%). CONCLUSIONS--Additives of MDIs may cause bronchoconstriction in some patients with asthma. In these patients inhalation from a pressurised metered dose inhaler is more likely to decrease the bronchodilator response than inhalation from an additive-free inhaler. The frequency of this phenomenon is unknown.

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Selected References

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