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Salbutamol Tolerance Onset

This study has been completed.
Sponsor:
ClinicalTrials.gov Identifier:
NCT01338311
First Posted: April 19, 2011
Last Update Posted: July 20, 2012
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Information provided by (Responsible Party):
University of Saskatchewan
  Purpose
Overuse of inhaled bronchodilator beta agonist medication results in a loss of effectiveness (i.e. tolerance). This has been shown for the short acting beta agonist salbutamol and the long acting beta agonist salmeterol. Tolerance to salmeterol is present within 24 hours. The onset of tolerance to salbutamol is not known.

Condition Intervention Phase
Asthma Drug: salbutamol Drug: Placebo Phase 4

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Triple (Participant, Investigator, Outcomes Assessor)
Primary Purpose: Basic Science
Official Title: Salbutamol: Tolerance to Bronchoprotection vs. Methacholine: Time Course of Onset

Resource links provided by NLM:


Further study details as provided by University of Saskatchewan:

Primary Outcome Measures:
  • Airway responsiveness as a measure of salbutamol bronchoprotection [ Time Frame: ten minutes post 200mcg salbutamol on day 1 ]
    Regular use of salbutamol results in loss of bronchoprotection. The primary outcome is to determine the onset of this tolerance.

  • Airway responsiveness as a measure of salbutamol bronchoprotection [ Time Frame: ten minutes post 200mcg salbutamol on day 3 ]
    Regular use of salbutamol results in loss of bronchoprotection. The primary outcome is to determine the onset of this tolerance.

  • Airway responsiveness as a measure of bronchoprotection. The primary outcome is to determine the onset of this tolerance. [ Time Frame: ten minutes post 200mcg salbutamol on day 5 ]
    Regular use of salbutamol results in loss of bronchoprotection. The primary outcome is to determine the onset of this tolerance.

  • Airway responsiveness as a measure of salbutamol bronchoprotection [ Time Frame: ten minutes post 200mcg salbutamol on day 7 ]
    Regular use of salbutamol results in loss of bronchoprotection. The primary outcome is to determine the onset of this tolerance.


Enrollment: 15
Study Start Date: March 2011
Study Completion Date: March 2012
Primary Completion Date: March 2012 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: salbutamol Drug: salbutamol
200mcg twice daily for a total of 7 doses
Placebo Comparator: placebo
200mcg twice daily for a total of 7 doses
Drug: Placebo
200mcg twice a day for a total of 7 doses (3.5 days).

  Eligibility

Information from the National Library of Medicine

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

Inclusion Criteria:

  • male or female
  • 18 to 65 years of age
  • non smoker
  • beta agonist naive for at least 14 days
  • baseline FEV1 at least 70% predicted
  • no respiratory tract infection or allergen exposure (if atopic) within 4 weeks of visit 1

Exclusion Criteria:

  • poorly controlled asthma
  • pregnant or lactating women
  Contacts and Locations
Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01338311


Locations
Canada, Saskatchewan
University of Saskatchewan
Saskatoon, Saskatchewan, Canada, S7N 0W8
Sponsors and Collaborators
University of Saskatchewan
Investigators
Principal Investigator: Donald W Cockcroft, MD University of Saskatchewan
  More Information

Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Responsible Party: University of Saskatchewan
ClinicalTrials.gov Identifier: NCT01338311     History of Changes
Other Study ID Numbers: BMC 10-226
First Submitted: April 1, 2011
First Posted: April 19, 2011
Last Update Posted: July 20, 2012
Last Verified: July 2012

Additional relevant MeSH terms:
Albuterol
Bronchodilator Agents
Autonomic Agents
Peripheral Nervous System Agents
Physiological Effects of Drugs
Anti-Asthmatic Agents
Respiratory System Agents
Tocolytic Agents
Reproductive Control Agents
Adrenergic beta-2 Receptor Agonists
Adrenergic beta-Agonists
Adrenergic Agonists
Adrenergic Agents
Neurotransmitter Agents
Molecular Mechanisms of Pharmacological Action