Evaluation of the Quality of Life Questionnaire-Bronchiectasis (QOL-B) in Patients With Bronchiectasis

This study has been completed.
Information provided by (Responsible Party):
Gilead Sciences
ClinicalTrials.gov Identifier:
First received: December 5, 2008
Last updated: February 3, 2014
Last verified: February 2014

Over the 70-day study period, eligible patients visited the study clinic every 2 weeks (total of 6 visits) and received a 28-day course of aztreonam for inhalation solution (AZLI). The Quality of Life-Bronchiectasis (QOL-B) questionnaire was completed at several time points during the study, in additional to pulmonary function testing and other standard procedures.

Condition Intervention Phase
Drug: AZLI
Phase 2

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: An Open-Label, Multicenter Trial to Validate the Quality of Life Questionnaire-Bronchiectasis and to Evaluate Perception of Symptom Improvement Following One Course of Aztreonam for Inhalation Solution (AZLI) in Subjects With Bronchiectasis and Gram-negative Bacteria in the Airways

Resource links provided by NLM:

Further study details as provided by Gilead Sciences:

Primary Outcome Measures:
  • Reliability of the Respiratory Domain of the Quality of Life Questionnaire-Bronchiectasis (QOL-B) [ Time Frame: Day -14 to Day 0 ] [ Designated as safety issue: No ]

    Test-retest reliability is a measure of the stability or reproducibility of a measure over a period of time during which status on the underlying construct has not changed, and is measured by the intraclass correlation of scores obtained at 2 time points within that period. Test-retest reliability of respiratory symptoms was calculated for response at Day -14 and Day 0. Reliability of the participants' QOL-B responses was assessed from an Intraclass Correlation Coefficient (ICC). A score of ≥ 0.70 would indicate strong reliability.

    The QOL-B respiratory symptoms score was transformed onto a scale of 0-100, with higher scores representing a better quality of life.

  • Convergent Validity of the Respiratory Domain of the QOL-B [ Time Frame: Day -14 ] [ Designated as safety issue: No ]
    Convergent validity was assessed at Day -14 by examining the correlations between relevant QOL-B domains and other indicators of health status: a bronchiectasis severity score based on high-resolution computerised tomography (HRCT) scan results, forced expiratory volume in 1 second (FEV1) percent predicted, 6-minute walk test (6MWT) results, and St. George's Respiratory Questionnaire (SGRQ) symptoms scores. Correlations with absolute values of 0.30 to 0.50 indicated moderate evidence of convergent validity.

Secondary Outcome Measures:
  • Responsiveness of the Respiratory Domain of the QOL-B as Assessed by the Anchor-based Minimal Clinically Important Difference (MCID) Following Categorization of Level of Change Using the Global Rating of Change Questionnaire (GRCQ) [ Time Frame: Day 0 to Day 28 ] [ Designated as safety issue: No ]

    The anchor-based method measured the participant's perception of change at Day 28 using the GRCQ, which assesses improving/worsening symptoms. Distribution of ratings was categorized as no change (-1 to 1), minimal change (≥ 1.1 to < 3.1 or ≤ -1.1 to > -3.1), moderate change (≥ 3.1 to < 5.1 or ≤ -3.1 to > -5.1) or large change (≥ 5.1, ≤ -5.1). The GRCQ evaluated change in respiratory symptoms on a visual analog scale from -7 (worsening) to +7 (improvement). The following algorithm was used to obtain the mean change:

    If the corresponding GRCQ score was in the "no change" group, then change from baseline QOL-B = Observed QOL-B change from baseline score; if > 1, then change from baseline QOL-B score = Observed QOL-B change from baseline score; if < -1, the change from baseline QOL-B score = (-1) * Observed QOL-B change from baseline score.

    Then the mean change from baseline of QOL-B respiratory symptoms score of the minimal change category group is the anchor-based MCID.

Enrollment: 89
Study Start Date: December 2008
Study Completion Date: October 2009
Primary Completion Date: October 2009 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: AZLI
Participants were evaluated beginning 14 days prior to starting a 28-day course of AZLI (Day 0 to Day 28), followed by post-treatment assessments every 14 days through Day 56, for a total of 70 days of participation in the study.
Drug: AZLI
75 mg aztreonam for inhalation solution (AZLI), administered 3 times daily using the PARI Investigational eFlow® Nebulizer System (with a minimum of 4 hours between doses) following administration of a short-acting bronchodilator
Other Name: Cayston®


Ages Eligible for Study:   18 Years and older
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Written informed consent prior to any study-related procedures
  • Ability to read and understand the English language
  • Bronchiectasis confirmed by CT scan of the chest
  • Previous treatment with antibiotics for bronchiectasis
  • Documented history of positive sputum culture for a gram-negative organism within 5 years
  • Positive sputum culture for a gram-negative organism at first visit (Day -14)

Exclusion Criteria:

  • Hospitalization or hemoptysis > 30 mL within 14 days of first visit (Day -14)
  • Antibiotic use for respiratory symptoms within 14 days of first visit (Day -14), excluding chronic, stable azithromycin use
  • Change in corticosteroid or bronchodilator regimen within 14 days of first visit (Day -14)
  • Forced expiratory volume in 1 second (FEV1) < 25% predicted approximately 15 minutes following use of a bronchodilator at first visit (Day -14)
  • Cigarette smoking within 6 months of first visit (Day -14)
  Contacts and Locations
Please refer to this study by its ClinicalTrials.gov identifier: NCT00805025

  Show 24 Study Locations
Sponsors and Collaborators
Gilead Sciences
Study Director: Steve Lamola, MD Gilead Sciences
  More Information

No publications provided

Responsible Party: Gilead Sciences
ClinicalTrials.gov Identifier: NCT00805025     History of Changes
Other Study ID Numbers: GS-US-219-0102
Study First Received: December 5, 2008
Results First Received: September 9, 2013
Last Updated: February 3, 2014
Health Authority: United States: Food and Drug Administration

Additional relevant MeSH terms:
Bronchial Diseases
Respiratory Tract Diseases

ClinicalTrials.gov processed this record on April 16, 2014