Multi Breath Nitrogen Washout (MBNW) as a Measure of Small Airway Function in Patients With Respiratory Disease

Asthma Clinical Trial

Official title: Measurements of Inhomogeneity of the Small Airway With Patients With Cystic Fibrosis, Asthma and Bronchiolitis Obliterans Syndrome (Post Transplant) Using the Multi Breath Nitrogen Washout Technique

Status Recruiting

Clinical Trial Summary

The researchers are investigating a novel technique, the multi breath nitrogen washout technique, to measure airway changes in various respiratory diseases.

Clinical Trial Description

It is well documented that there are significant ventilatory changes in respiratory diseases such as cystic fibrosis, asthma and the onset of bronchiolitis obliterans syndrome (BOS) following chronic rejection of lung transplantation. At present, we use measures such as spirometry and lung biopsies to determine the changes of airway function and disease severity. Our aim is to develop a novel technique called the multi breath nitrogen washout (MBNW) which we believe is able to measure the inhomogeneity of ventilation in both the larger airways (conductive region, generation 1 - 16) as well as the smaller airways (acinar region 17 - 23). Our belief is that these measurements are much more subtle than current techniques and will be more sensitive in measuring large and small airway changes in disease. The MBNW can also give us an insight as to which particular zones of the lung are affected in differing respiratory disease. For example, it is believed that BOS begins at the distal portion of the lung (acinar region) and proceeds towards the proximal zone (conductive). However, at present no current techniques can differentiate between damage to the acinar zone and the conductive zone or indeed accurately measure small airway (acinar zone) function. We believe the the MBNW has the capacity to do so. ;

Study Design

Observational Model: Defined Population, Time Perspective: Cross-Sectional

Related Conditions & MeSH terms

• Asthma
• Bronchiolitis
• Bronchiolitis Obliterans
• Cystic Fibrosis
• Fibrosis
• Lung Transplantation

• NCT number: NCT00163696
• Study type: Observational
• Source: Bayside Health
• Contact: Bruce Thompson
• Phone: ++61 3 9276 3476
• Email: b.thompson@alfred.org.au
• Status: Recruiting
• Phase: N/A
• Start date: September 2004