Diesel Exhaust Particles and Leukotriene Production

Status

Withdrawn

Phases

Unknown

Study type

Observational

Source

ClinicalTrials.gov

Registry ID

NCT00915447

Enrollment

Registered

2009-06-08

Start date

2008-04-30

Completion date

2013-04-11

Last updated

2019-01-23

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Allergic Rhinitis

Keywords

Cat Allergic Rhinitis

Brief summary

The purpose of this study is to measure the effects of allergens and/or diesel exhaust particles in the nose to learn more about allergic responses in individuals with cat allergic rhinitis.

Interventions

None listed

Study design

Observational model

COHORT

Time perspective

PROSPECTIVE

Eligibility

Sex/Gender

ALL

Age

18 Years to 65 Years

Healthy volunteers

Inclusion criteria

1. Age 18 to 65 years old. 2. Positive prick (epicutaneous) skin test to standardized cat with a wheal equal to or greater than 3 mm and with a surrounding flare. 3. Ability to give informed consent.

Exclusion criteria

1. Pregnancy or breast-feeding. (Pregnancy and the period during breast feeding can affect nasal congestion and be a confounder in this regard.) 2. Systemic corticosteroid use within the previous three months or anytime during the challenge protocol. 3. Topical nasal corticosteroid use within the past month or anytime during the challenge protocol. 4. Systemic antihistamines or decongestant use within past two weeks or anytime during the trial. 5. Chronic sinusitis or chronic non-allergic rhinitis. 6. Use of reserpine. 7. Cigarette smoking within the past year or during the challenge protocol 8. Use of topical nasal antihistamines, chromoglycolates (chromolyn, Cromlon®), decongestants or non-steroidal anti-inflammatory agents (NSIADS) within the preceding week or anytime during the challenge protocol. 9. Present or treatment within the past 10 years with allergy immunotherapy (injections). 10. Present or past treatment with anti-IgE therapy. 11. Any unusual exposure to air pollutants (e.g., working as a diesel mechanic) that, in the opinion of the investigators, might compromise the individual's ability to participate in the study. 12. Living arrangement where the subject has a cat dwelling within the subject's habitation. 13. Any serious heart, lung, neurological or kidney disease that in the opinion of the investigators would impair the individual's ability to participate in the study. 14. Use of asthma-required medications.

Countries

United States

Outcome results