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The Incidence of Nontuberculous Mycobacterial Pulmonary Infection in Bilateral Bronchiectasis and Bronchiolitis

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified March 2012 by Meir Medical Center.
Recruitment status was:  Recruiting
Information provided by (Responsible Party):
Meir Medical Center Identifier:
First received: May 16, 2011
Last updated: March 10, 2013
Last verified: March 2012

Nontuberculous mycobacteria (NTM) are ubiquitous organisms in the environment and are now increasingly being recognized as significant causes of chronic pulmonary infection in immunocompetent individuals (1). The most frequently encountered NTM lung disease worldwide is caused by Mycobacterium avium-intracellular complex (MAC) (2-4).

In several studies with chest computed tomography (CT), researchers have demonstrated that the presence of bilateral multifocal bronchiolitis (well-defined small nodules and branching centrilobular nodules, or tree-in-bud pattern) and bronchiectasis distributed mainly in the right middle lobe and lingular segment are indicative of NTM pulmonary infection (7-11). Accordingly, it is believed that radiologic findings of bilateral bronchiolitis and bronchiectasis on chest CT scans specifically suggest NTM pulmonary infection (1). These CT findings, however, may not be specific for NTM pulmonary infection. CT patterns of bronchiectasis and bronchiolitis in the pulmonary infections caused by various NTM organisms have been reported, and these organisms include Mycobacterium kansasii, Mycobacterium xenopi, and rapidly growing mycobacteria such as Mycobacterium abscessus, Mycobacterium fortuitum, and Mycobacterium chelonae (12-14). In addition, not all patients with bronchiectasis and bronchiolitis have NTM pulmonary infection. Two recent studies showed that only about 50% of patients with such CT features have MAC pulmonary infection (9,15). To the best of our knowledge, however, there is no report about the incidence of NTM in patients with bronchiectasis or bronchiolitis in countries with low incidence of TB. Thus, the purpose of our study was to determine the frequency of NTM pulmonary infection in patients with bilateral bronchiectasis and bronchiolitis at chest CT and to investigate whether these CT findings are specifically indicative of MAC infection or other specific pathogen.

Bronchiectasis Bronchiolitis

Study Type: Observational
Study Design: Observational Model: Cohort
Time Perspective: Prospective

Further study details as provided by Meir Medical Center:

Primary Outcome Measures:
  • The number of patients with NTM grouth among the the patients with double sided bronchiectasis or bronchiolitis. [ Time Frame: Two years ]

Estimated Enrollment: 150
Study Start Date: May 2011
Estimated Study Completion Date: July 2013
Estimated Primary Completion Date: July 2013 (Final data collection date for primary outcome measure)
  Show Detailed Description


Ages Eligible for Study:   18 Years to 90 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Probability Sample
Study Population
All patients with bronchiectasis or bronchiolitis

Inclusion Criteria:

  • All patients with bronchiectasis or bronchiolitis

Exclusion Criteria:

  • All patients with severe lung disease other than bronchiectasis
  • Active lung infection
  • Active infection other site except the lung
  Contacts and Locations
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Please refer to this study by its identifier: NCT01354912

Meir Medical Center Recruiting
Kfar Saba, Israel
Contact: David Shitrit, M.D    972-9-7472161   
Principal Investigator: David Shitrit, M.D         
Sponsors and Collaborators
Meir Medical Center
  More Information

Responsible Party: Meir Medical Center Identifier: NCT01354912     History of Changes
Other Study ID Numbers: 2011-001
Study First Received: May 16, 2011
Last Updated: March 10, 2013

Keywords provided by Meir Medical Center:
mycobacterial infection
ct scan

Additional relevant MeSH terms:
Bronchial Diseases
Respiratory Tract Diseases
Lung Diseases, Obstructive
Lung Diseases
Respiratory Tract Infections processed this record on September 21, 2017