Document Detail


Sputum induction: effect of nebulizer output and inhalation time on cell counts and fluid-phase measures.
MedLine Citation:
PMID:  11696050     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: A knowledge of the factors that can affect induced sputum results is essential in order to standardize the procedure. OBJECTIVE: We investigated the influence of nebulizer output on sputum cell counts and fluid phase measurements at increasing times of sputum induction. METHODS: Eighteen adults with stable asthma inhaled an aerosol of 3% hypertonic saline to induce sputum after 7, 14 and 21 min on 2 days separated by 48 h. On one day, in random order, the ultrasonic nebulizer used had a relatively low output of 0.87 mL/min (particle size 5.58 microm mass median aerodynamic diameter, MMAD) and, on the other, a higher output of 1.90 mL/min (particle size 4.14 microm MMAD). The sputum was selected from each expectorate and examined blind to the induction procedures. RESULTS: With both nebulizers, the 14- and 21-min samples were lower in weight, neutrophils, eosinophils, eosinophil cationic protein (ECP) and interleukin (IL)-8 and higher in macrophages. The higher output nebulizer induced sputum with higher cell viability and lower ECP and IL-8. CONCLUSION: The results identify that the volume of hypertonic saline inhaled in sputum induction influences the fluid-phase measurements. The duration of induction does alter the cell counts and suggests that the later expectorated sputum samples originate from more peripheral airways. The results draw attention to the need to standardize the volume and time of nebulization to accurately interpret and compare results.
Authors:
J Belda; P Hussack; M Dolovich; A Efthimiadis; F E Hargreave
Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Clinical and experimental allergy : journal of the British Society for Allergy and Clinical Immunology     Volume:  31     ISSN:  0954-7894     ISO Abbreviation:  Clin. Exp. Allergy     Publication Date:  2001 Nov 
Date Detail:
Created Date:  2001-11-06     Completed Date:  2002-01-31     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8906443     Medline TA:  Clin Exp Allergy     Country:  England    
Other Details:
Languages:  eng     Pagination:  1740-4     Citation Subset:  IM    
Affiliation:
The Asthma Research Group, Department of Medicine and Nuclear Medicine, St Joseph' s Healthcare and McMaster University, Hamilton, Ontario, Canada.
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MeSH Terms
Descriptor/Qualifier:
Administration, Inhalation
Adult
Asthma / drug therapy
Blood Proteins / drug effects
Cell Count / methods
Cross-Over Studies
Cross-Sectional Studies
Eosinophil Granule Proteins
Eosinophils / drug effects
Female
Forced Expiratory Volume / drug effects
Humans
Inhalation Exposure
Interleukin-8
Macrophages / drug effects
Male
Nebulizers and Vaporizers
Neutrophils / drug effects
Ribonucleases*
Saline Solution, Hypertonic / pharmacology
Sputum* / chemistry,  cytology,  drug effects
Time Factors
Chemical
Reg. No./Substance:
0/Blood Proteins; 0/Eosinophil Granule Proteins; 0/Interleukin-8; 0/Saline Solution, Hypertonic; EC 3.1.-/Ribonucleases

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