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The Use of Oral N-Acetyl Cysteine for the Treatment of Chronic Sinonasal Symptoms

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. Identifier: NCT00866866
Recruitment Status : Unknown
Verified March 2009 by University of Calgary.
Recruitment status was:  Recruiting
First Posted : March 23, 2009
Last Update Posted : March 23, 2009
Information provided by:
University of Calgary

Brief Summary:

Chronic sinonasal symptoms (CSNS), such as coughing, throat clearing, nasal obstruction, crusting, dryness and discharge are extremely common in the general population. Although the physical symptoms are readily apparent, the psychosocial impact is often overlooked. Depression, anxiety, fear of social interaction, impaired personal relationships and decreased performance at work have all been associated with CSNS, often leading to multiple, frequent visits to the patient's primary care physician. A variety of clinical studies have shown that health-related quality of life (HRQoL) is significantly impaired in people with CSNS, with depressive symptoms being particularly common.

CSNS may be due, in part, to tenacious nasal and paranasal secretions. It is therefore conceivable that a mucolytic may thin these secretions and improve mucociliary clearance, thereby reducing CSNS. N-acetylcysteine (NAC) is the most widely used mucolytic agent, particularly in patients with cystic fibrosis (CF), and has been documented as the most effective of the mucokinetic agents. Our group wishes to examine the use of NAC as a treatment for CSNS by testing the hypothesis that oral NAC reduces symptoms of CSNS compared to placebo.

Condition or disease Intervention/treatment Phase
Chronic Sinonasal Symptoms Drug: N-Acetyl Cysteine Drug: Placebo Phase 4

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 60 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double (Participant, Investigator)
Primary Purpose: Treatment
Official Title: The Use of Oral N-Acetyl Cysteine for the Treatment of Chronic Sinonasal Symptoms: A Randomized, Double-Blind, Placebo-Controlled Trial
Study Start Date : March 2009
Estimated Primary Completion Date : December 2009
Estimated Study Completion Date : May 2010

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Experimental: N-Acetyl Cysteine Drug: N-Acetyl Cysteine
600 mg PO BID

Placebo Comparator: Placebo Drug: Placebo
1 tab PO BID

Primary Outcome Measures :
  1. Sinonasal Outcomes Test (SNOT) - 22 [ Time Frame: 6 weeks ]

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 65 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • one or more the following symptoms: nasal stuffiness, nasal dryness or crusting, nasal congestion, discolored nasal discharge, or thick nasal discharge, for four or more days a week in the preceding two weeks

Exclusion Criteria:

  • poorly controlled asthma
  • cystic fibrosis
  • chronic obstructive pulmonary disease (COPD)
  • severe coronary artery disease
  • vasculopathy
  • poorly controlled diabetes
  • poorly controlled hypertension
  • women who are breastfeeding

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 identifier (NCT number): NCT00866866

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Contact: Brad Mechor, MD (403) 944-3628

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Canada, Alberta
University of Calgary Recruiting
Calgary, Alberta, Canada
Contact: Brad Mechor, MD    (403) 944-3628      
Principal Investigator: Brad Mechor, MD         
Sponsors and Collaborators
University of Calgary
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Study Director: Warren Yunker, MD, PhD University of Calgary

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Responsible Party: Dr. B. Mechor, University of Calgary Identifier: NCT00866866    
Other Study ID Numbers: 21571
First Posted: March 23, 2009    Key Record Dates
Last Update Posted: March 23, 2009
Last Verified: March 2009
Additional relevant MeSH terms:
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Antiviral Agents
Anti-Infective Agents
Respiratory System Agents
Free Radical Scavengers
Molecular Mechanisms of Pharmacological Action
Protective Agents
Physiological Effects of Drugs