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Utility of Induced Sputum Using Hypertonic Saline to Evaluate Infection and Inflammation in Cystic Fibrosis

This study has been completed.
Information provided by (Responsible Party):
Felix Ratjen, The Hospital for Sick Children Identifier:
First received: July 21, 2008
Last updated: August 30, 2013
Last verified: August 2013
The objective of the study is to evaluate the clinical utility and the feasibility, in an outpatient setting, of sputum induction using hypertonic saline. This study will also study pilot techniques on a sub using a sub-sample to assess the lower airway inflammatory cells and markers in relation to new emerging organisms in cystic fibrosis (CF) and antibiotic therapy in CF.

Condition Intervention Phase
Cystic Fibrosis
Drug: Hypertonic Saline
Phase 2

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Diagnostic
Official Title: Diagnostic Utility of Induced Sputum Using Hypertonic Saline to Evaluate Airway Infection and Inflammation in Cystic Fibrosis

Resource links provided by NLM:

Further study details as provided by The Hospital for Sick Children:

Primary Outcome Measures:
  • Additional positive bacterial culture yield post IS technique for known and emerging CF pathogens over conventional methods of bacterial culturing (ES and TS). [ Time Frame: 60 minutes; for subgroup, this will be repeated a second time after 14 days. ]

Secondary Outcome Measures:
  • Inflammatory profile as measured by relative neutrophil count and IL-8 concentration in the IS [ Time Frame: 60 minutes; for subgroup, this will be repeated a second time after 14 days. ]
  • Bacterial colony counts [ Time Frame: 60 minutes; for subgroup, this will be repeated a second time after 14 days. ]
  • Frequency of change in clinical management based on results from IS [ Time Frame: 60 minutes; for subgroup, this will be repeated a second time after 14 days. ]

Enrollment: 95
Study Start Date: December 2006
Study Completion Date: May 2008
Primary Completion Date: May 2008 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: 1 Drug: Hypertonic Saline
After each subject has performed post-bronchodilator spirometry, he/she will inhale increasing concentrations of 3, 4, and 5% of hypertonic saline for 7 minutes each for 3 cycles until expectorating a sufficient sputum sample.

Detailed Description:

Chronic airway infection, mainly by Staphylococcus aureus (SA) and Pseudomonas aeruginosa (PA), is a major cause of morbidity and mortality in patients with cystic fibrosis (CF). Isolation of organisms from the respiratory tract is important to optimize treatment. The current recommended methods for bacterial evaluation are bronchoalveolar lavage (BAL) and expectorated sputum (ES) analysis. However, a significant proportion of young CF patients cannot produce sputum spontaneously. The method used most frequently therefore is to isolate respiratory organisms is to perform throat swabs (TS) which have poor sensitivity and specificity in the evaluation of respiratory pathogens in CF patients.

Induced sputum (IS) using hypertonic saline has been used in a limited number of studies to evaluate respiratory organisms in CF patients. These studies have reported that IS may be a useful non-invasive diagnostic test to increase the yield of detection of respiratory pathogens.

Beside its use as a diagnostic test to identify bacterial pathogens induced sputum has been used to assess lower airway inflammation in CF. While numerous studies have clarified the role of S. aureus and P. aeruginosa in CF lung disease, the role of other emerging bacteria such as Stenotrophomonas maltophilia (SM) and Achromobacter xylosoxidans (AX) species remains largely unclear. IS offers the potential to possibly differentiate between colonisation and infection for the emerging pathogens and to help clarify their role in CF lung disease.


Ages Eligible for Study:   6 Years to 18 Years   (Child, Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  1. Children diagnosed with CF (by sweat chloride ≥60 and/or genetic testing)
  2. Children ages between 6-18 years
  3. Ability to perform pulmonary function tests
  4. FEV1 ≥ 30% predicted18.

Additional inclusion criteria for sub-sample undergoing antibiotic therapy:

  1. Above criteria
  2. Admitted to hospital for i.v. antibiotic therapy

Exclusion Criteria:

  1. Acute respiratory distress or hypoxia (oxygen saturation <92% at room air)
  2. New onset of wheezing
  3. Previous history of intolerance of inhalation of HS
  Contacts and Locations
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Please refer to this study by its identifier: NCT00721071

Canada, Ontario
The Hospital for Sick Children
Toronto, Ontario, Canada, M5G 1X8
Sponsors and Collaborators
The Hospital for Sick Children
Principal Investigator: Felix Ratjen, MD The Hospital for Sick Children, Toronto Canada
  More Information

Responsible Party: Felix Ratjen, Division Head, Respiratory Medicine, The Hospital for Sick Children Identifier: NCT00721071     History of Changes
Other Study ID Numbers: 1000009154
Study First Received: July 21, 2008
Last Updated: August 30, 2013

Keywords provided by The Hospital for Sick Children:
Cystic Fibrosis
Hypertonic Saline
Induced Sputum
Expectorated Sputum

Additional relevant MeSH terms:
Cystic Fibrosis
Pathologic Processes
Pancreatic Diseases
Digestive System Diseases
Lung Diseases
Respiratory Tract Diseases
Genetic Diseases, Inborn
Infant, Newborn, Diseases processed this record on May 22, 2017