Document Detail

Influence of inspiratory capacity on bronchodilatation via Turbuhaler or pressurized metered-dose inhaler in asthmatic children: a comparison.
MedLine Citation:
PMID:  9282236     Owner:  NLM     Status:  MEDLINE    
This study was designed to compare the bronchodilatatory effect of terbutaline inhaled through Turbuhaler (TH) or pressurized metered-dose inhaler (pMDI) in young asthmatics, and to assess the possible relationship between patients' inspiratory capacity and bronchodilatation for both devices. One hundred and eighteen asthmatics (aged 4 10/12-20 6/12 years) with bronchial obstruction (mean Vmax 50%: 59.5% pred, SD 17.8% pred) were allocated at random to two groups of 59 patients to inhale 0.5 mg terbutaline either by TH or by pMDI (and placebo by dummy of the other device). In- and expiratory spirometry and bodyplethysmography were conducted before and 10 min after inhalation. Bronchodilatation was effective [change in airways resistance (delta RAW) -50%, change in forced expiratory volume in 1 s (delta FEV1)+15%, delta Vmax 50% or 25% + 25% of baseline] in 41 of 59 patients with pMDI (69.5%) and 33 of 59 patients with TH (55.9%). The effect on Vmax 50% was significantly better with pMDI than with TH. Turbuhaler users with higher inspiratory flow [forced inspiratory volume in 1 s (FIV1), forced inspiratory flow at 50% vital capacity (FIF50)] reached better bronchodilatation, while bronchodilatatory effect was not correlated with inspiratory performance in MDI users. Peak inspiratory flow (PIF) did not correlate well with bronchodilatation by TH. When using TH for bronchodilatation, the effectiveness of terbutaline depends upon the degree of inspiratory capacity. This can lead to impaired bronchodilatatory effect in subgroups of obstructive young asthmatics with low inspiratory flow. In contrast, when using a pMDI, inspiratory capacity does not seem to influence the effectiveness of terbutaline.
T Hirsch; M Peter-Kern; R Koch; W Leupold
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Respiratory medicine     Volume:  91     ISSN:  0954-6111     ISO Abbreviation:  Respir Med     Publication Date:  1997 Jul 
Date Detail:
Created Date:  1997-09-15     Completed Date:  1997-09-15     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8908438     Medline TA:  Respir Med     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  341-6     Citation Subset:  IM    
Children's Clinic, University Hospital Dresden, Germany.
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MeSH Terms
Asthma / drug therapy*,  physiopathology
Bronchi / drug effects*,  physiopathology
Bronchodilator Agents / administration & dosage*,  therapeutic use
Child, Preschool
Double-Blind Method
Drug Delivery Systems
Inspiratory Capacity
Nebulizers and Vaporizers*
Respiratory Function Tests
Terbutaline / administration & dosage*,  therapeutic use
Reg. No./Substance:
0/Bronchodilator Agents; 23031-25-6/Terbutaline

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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