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Bronchial Thermoplasty in Severe Persistent Asthma (PAS2)

This study is ongoing, but not recruiting participants.
Information provided by (Responsible Party):
Boston Scientific Corporation Identifier:
First received: April 15, 2011
Last updated: March 30, 2015
Last verified: May 2014
As Conditions of Approval of the PMA for the Alair System, the FDA requires Boston Scientific to generate data to assess the durability of the BT treatment effect as well as safety data in the intended use population in the United States.

Condition Intervention Phase
Severe Asthma
Device: Alair System
Phase 4

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: Post-FDA Approval Clinical Trial Evaluating Bronchial Thermoplasty in Severe Persistent Asthma

Further study details as provided by Boston Scientific Corporation:

Primary Outcome Measures:
  • Subjects experiencing severe exacerbations [ Time Frame: Year 1 vs. Year 2, 3, 4, 5 ]
    The primary endpoint will be the proportion of subjects experiencing severe exacerbations during the subsequent 12-month (for Years 2, 3, 4, and 5) compared to the first 12-month after the Alair treatment.

Secondary Outcome Measures:
  • Rates of Severe exacerbations [ Time Frame: Year 1-5 ]
    (exacerbations / subject / year)

  • Respiratory adverse events [ Time Frame: Year 1-5 ]
    A respiratory adverse event is defined as any sign, symptom, illness, clinically significant abnormal laboratory value, or other adverse medical event associated with the "Respiratory System" that appears or worsens in a subject during a clinical study, regardless of whether or not it is considered related to the procedure used as part of the protocol.

  • Emergency room visits for respiratory symptoms [ Time Frame: Year 1-5 ]
    Emergency room visits for respiratory symptoms (rates of emergency room visits)

  • Emergency room visits for respiratory symptoms [ Time Frame: Year 1-5 ]
    Emergency room visits for respiratory symptoms (proportion of subjects with emergency room visits for respiratory symptoms)

  • Hospitalizations for respiratory symptoms [ Time Frame: Year 1-5 ]
    (hospitalizations/ subject/ year)

  • Hospitalizations for respiratory symptoms [ Time Frame: Year 1-5 ]
    (the proportion of subjects with hospitalizations for respiratory symptoms)

  • Respiratory Serious Adverse Events [ Time Frame: Year 1-5 ]
    Pre-bronchodilator FEV1

  • Respiratory Serious Adverse Events [ Time Frame: Year 1-5 ]
    Post-bronchodilator FEV1

Enrollment: 284
Study Start Date: April 2011
Estimated Study Completion Date: December 2019
Estimated Primary Completion Date: December 2019 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Alair
Alair system
Device: Alair System
Treatment of airways with the Alair System

Detailed Description:
This is a multicenter, open-label, single arm study designed to demonstrate durability of the treatment effect and to evaluate the short-term and longer-term safety profile of the Alair System in the United States in the intended use population (patients 18 years and older with severe persistent asthma).

Ages Eligible for Study:   18 Years to 65 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  1. Subject is an adult between the ages of 18 to 65 years.
  2. Subject is able to read, understand, and sign a written Informed Consent to participate in the study and able to comply with the study protocol.
  3. Subject has asthma and is taking regular maintenance medication that includes:

    1. Inhaled corticosteroid (ICS) at a dosage greater than 1000μg beclomethasone per day or equivalent, AND long acting β2-agonist (LABA) at a dosage of ≥80μg per day Salmeterol or equivalent.
    2. Other asthma medications such as leukotriene modifiers, or anti-IgE, are acceptable (Subjects on Xolair® must have been on Xolair for greater than 1 year).
    3. Oral corticosteroids (OCS) at a dosage of up to, but not greater than 10mg per day are acceptable.*
  4. Subject has a pre-bronchodilator FEV1 of greater than or equal to 60% of predicted.
  5. Subject is a non-smoker for 1 year or greater (if former smoker, less than 10 pack years total smoking history).
  6. Subject is able to undergo outpatient (same day) bronchoscopy in the opinion of the investigator or per hospital guidelines.
  7. Subject has at least 2 days of asthma symptoms in the last 4 weeks.
  8. Subject has an AQLQ score during the baseline period of 6.25 or less.

    • NOTE: Subjects on a dosage regimen of 20mg OCS every other day may be included as this is equivalent to an average daily dosage of 10mg.

Exclusion Criteria:

  1. Subject is participating in another clinical trial within 6 weeks of the Baseline Period involving respiratory intervention that could affect the outcome measures of this Study.
  2. Over the last 7 days of a 4 week medication stable period, subject requirement for rescue medication use other than for prophylactic use for exercise exceeds an average of:

    1. 8 puffs per day of short-acting bronchodilator, or
    2. 4 puffs per day of long-acting rescue bronchodilator, or
    3. 2 nebulizer treatments per day. At the discretion of the Principal Investigator, subjects considered as unstable on baseline medications may have medications adjusted and re-evaluated after a 4 week medication stabilization period.
  3. Subject has a post-bronchodilator FEV1 of less than 65%.
  4. Subject has a history of life-threatening asthma, defined by past intubation for asthma, or ICU admission for asthma within the prior 2 years.
  5. Subject has 3 or more hospitalizations for exacerbations of asthma in the previous year.
  6. Subject has had 4 or more infections of lower respiratory tract (LRTI) requiring antibiotics in the past 12 months.
  7. Subject has had 4 or more pulses of systemic corticosteroids (tablets, suspension or injection) for asthma symptoms in the past 12 months.
  8. Subject has a known sensitivity to medications required to perform bronchoscopy (such as lidocaine, atropine and benzodiazepines).
  9. Subject has other respiratory diseases including emphysema, cystic fibrosis, vocal cord dysfunction, mechanical upper airway obstruction, Churg-Strauss syndrome, and allergic bronchopulmonary aspergillosis (asthma, immediate cutaneous reactivity to A. fumigatus, total serum IgE of >1000ng/mL, elevated specific IgE and IgG to A. fumigatus with or without evidence of central bronchiectasis).
  10. Subject has segmental atelectasis, lobar consolidation, significant or unstable pulmonary infiltrate, or pneumothorax, confirmed on x-ray.
  11. Subject currently has clinically significant cardiovascular disease, including myocardial infarction, angina, cardiac dysfunction, cardiac dysrhythmia, conduction defect, cardiomyopathy, or stroke.
  12. Subject has a known aortic aneurysm.
  13. Subject has significant co-morbid illness such as cancer, renal failure, liver disease, or cerebral vascular disease.
  14. Subject has uncontrolled hypertension (>200mm Hg systolic or >100mm Hg diastolic pressure).
  15. Subject has an implanted electrical stimulation device (e.g., a pacemaker, cardiac defibrillator, or deep nerve or deep brain stimulator).
  16. Subject has coagulopathy (INR > 1.5).
  17. Subject has any other medical condition that would make them inappropriate for study participation, in the Investigator's opinion.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01350336

  Hide Study Locations
United States, Alabama
University of Alabama at Birmingham Lung Health Center
Birmingham, Alabama, United States, 35294
United States, Connecticut
Yale University Center for Asthma and Airway Disease
New Haven, Connecticut, United States, 06520
United States, Illinois
University of Chicago
Chicago, Illinois, United States, 60637
United States, Iowa
University of Iowa
Iowa City, Iowa, United States, 52242
United States, Louisiana
LSU Health Sciences
New Orleans, Louisiana, United States, 70112
United States, Massachusetts
St. Elizabeth's Medical Center
Boston, Massachusetts, United States, 02135
Beth Israel Deaconess Medical Center
Boston, Massachusetts, United States, 02215
Lahey Clinic
Burlington, Massachusetts, United States, 01805
United States, Michigan
Henry Ford Hospital
Detroit, Michigan, United States, 48202
Spectrum Health Hospitals
Grand Rapids, Michigan, United States, 49503
United States, Minnesota
HealthPartners Specialty Center, Lung and Sleep Health
St. Paul, Minnesota, United States, 55103
United States, Missouri
Washington University School of Medicine
St. Louis, Missouri, United States, 63110
United States, North Carolina
Duke University
Durham, North Carolina, United States, 27710
United States, Ohio
Cleveland Clinic Foundation
Cleveland, Ohio, United States, 44195
United States, Pennsylvania
DuBois Regional Medical Center
Dubois, Pennsylvania, United States, 15801
Pennsylvania State Hershey
Hershey, Pennsylvania, United States, 17033
University of Pennsylvania
Philadelphia, Pennsylvania, United States, 19104
United States, South Carolina
Medical University of South Carolina
Charleston, South Carolina, United States, 29425
United States, Virginia
University of Virginia Medical Center
Charlottesville, Virginia, United States, 22908
Pulmonary Associates of Richmond
Richmond, Virginia, United States, 23225
United States, Washington
Franciscan Research Center (St. Joseph Medical Center)
Tacoma, Washington, United States, 98405
MultiCare Pulmonary Specialists
Tacoma, Washington, United States, 98405
United States, Wisconsin
University of Wisconsin
Madison, Wisconsin, United States, 53792
Canada, British Columbia
Surrey Memorial Hospital
Surrey, British Columbia, Canada, V3T 0G9
Vancouver General Hospital, University of British Columbia
Vancouver, British Columbia, Canada, V5Z 1M9
Canada, Quebec
Montreal Chest Institute
Montreal, Quebec, Canada, H2X 2P4
Hospital Laval Centre de Pneumologie
Sainte-Foy, Quebec, Canada, G1V 4G5
Sponsors and Collaborators
Boston Scientific Corporation
Study Director: Thomas S Bowman, MD Boston Scientific Corporation
  More Information

Additional Information:
Responsible Party: Boston Scientific Corporation Identifier: NCT01350336     History of Changes
Other Study ID Numbers: 10-02
Study First Received: April 15, 2011
Last Updated: March 30, 2015

Additional relevant MeSH terms:
Bronchial Diseases
Respiratory Tract Diseases
Lung Diseases, Obstructive
Lung Diseases
Respiratory Hypersensitivity
Hypersensitivity, Immediate
Immune System Diseases processed this record on April 26, 2017