Home | About us | Editorial Board | Search | Ahead of print | Current Issue | Archives | Instructions | Online submissionContact Us   |  Subscribe   |  Advertise   |  Login  Page layout
Wide layoutNarrow layoutFull screen layout
Lung India Official publication of Indian Chest Society  
  Users Online: 533   Home Print this page  Email this page Small font size Default font size Increase font size
Year : 2008  |  Volume : 25  |  Issue : 1  |  Page : 8-13

The site of airway obstruction among patients of emphysema: Role of impulse oscillometry

1 Professor of Medicine Chief, Pulmonary Medicine and Sleep Center, Maulana Azad Medical College and Lok Nayak Hospital, New Delhi - 110 002., India
2 Department of Medicine, Maulana Azad Medical College and Lok Nayak Hospital, New Delhi - 110 002., India

Correspondence Address:
H S Hira
House 74, Block 21, Lodi Colony, New Delhi - 110 003.
Login to access the Email id

Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0970-2113.44130

Rights and Permissions

Objectives: To detect the site of airway obstruction in patients of emphysema by impulse oscillometry (IOS) and to compare its observatios with flow volume loop (FV loop) studies. Methods: Twenty-five patients of emphysema were subjected to both impulse os­cillometry (IOS) and conventional spirometry. The resulting impedance spectra by IOS and FV loop were utilized to identify the site of airway obstruction in each of the patients. Both methods applied were also compared for sensitivity to identify airway and specify the site of obstruction. Results: Four patients were excluded from the final analysis as their impedance spectra showed significant upper airway influence, which would have made the localization of the site of airway obstruction by IOS invalid. Both IOS and FV loop could detect airway obstruction in all 21 patients. FV loop localized the site of obstruction as combined central and peripheral airways in 15 patients (71.4%) and as peripheral in 6 (28.6%).The IOS however, revealed the presence of the predomi­nant site of obstruction peripheral in all the 21 patients, and both central and pe­ripheral obstruction in 5 patients (23.8%). Conclusions: IOS had proven to be advantageous over FV loop studies as it could identify central and peripheral airway obstruction separately and established the predominant site of obstruction.

Print this article     Email this article
 Next article
 Previous article
 Table of Contents

 Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
 Citation Manager
 Access Statistics
 Reader Comments
 Email Alert *
 Add to My List *
 * Requires registration (Free)

 Article Access Statistics
    PDF Downloaded371    
    Comments [Add]    
    Cited by others 2    

Recommend this journal