Inhaled Apocynin Decreases Reactive Oxygen Species Concentrations in Exhaled Breath Condensate in Mild Asthmatics
|Study Design:||Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
|Official Title:||Inhaled Apocynin Decreases Reactive Oxygen Species Concentrations in Exhaled Breath Condensate in Mild Asthmatics|
- blood pressure, peripheral blood differential count, lung functional tests, single breath carbon monoxide diffusing capacity [ Time Frame: 6 months ]
- determination of H2O2, NO2- and NO3- concentrations in exhaled breath condensate, determination of NO2 concentration in serum, blood pressure, peripheral blood differential count, lung functional tests, single breath carbon monoxide diffusing capacity [ Time Frame: 6 months ]
|Study Start Date:||June 2008|
|Study Completion Date:||November 2008|
|Primary Completion Date:||August 2008 (Final data collection date for primary outcome measure)|
Ten nonsmoking patients, suffering from mild bronchial asthma participated in the study (mean age 30±9 years, 5 men, 5 women). Asthma was diagnosed based on GINA 2008 criteria. The patients were free of any medication, at least 7 days before, and had not suffered from any infectious diseases including upper respiratory tract infections for at least 3 months prior to the study. Patients who did not meet these criteria were excluded from the study.
Drug: Apocynin nebulization
6 ml of apocynin of total dose 3 mg (0.5 mg/ml dissolved in sterile 0.9% NaCl as the study drug) has been nebulized for 15-20 min through the mouthpiece with using of a nose clip. A nebulizer Pulmo Aide AP-50 (DeVilbiss; Richmond, VA) was used (mass median aerosol diameter 3.1 mm, output 0.3 ml/min.)
The study had a double-blind, placebo-controlled, cross-over design, consisted of 2 visits, separated 30 ± 10 days. If during the first visit the drug was used, in the second visit - placebo or vice versa. Before and after procedure, safety measures (arterial blood pressure, heart rate value, and cough scale) were performed. The effect of a possible inhibitor of ROS formation was performed using corticosteroid-naive asthmatic subjects, which are more prone to oxidative stress than healthy non-smoking subjects. The study protocol was approved by the Ethics Committee of Medical University of Lodz (no. RNN/12/08/KE) and written consent was obtained from every subject prior to the study.
EBC was collected using a modification of the method described previously by Doniec et al.2005. The subjects breathed spontaneously through a mouthpiece for 20 min. Each subject wore a nose clip during this procedure. Approximately 2 ml of condensate was collected and immediately stored at −80°C until the procedure of H2O2, NO2- and NO3- measurement.
6 ml of apocynin of total dose 3 mg (0.5 mg/ml) has been nebulized through the mouthpiece with using of a nose clip.
The H2O2 concentration in EBC was measured according to the method applied previously by Nowak et al.2001. Determination of NO2- and NO3- with Griess solution was performed by micromethod, carried out in 96-well plates, according to Griess' method, modified the method described by Dziedzic et al.2003.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00992667
|Medical University of Lodz|
|Lodz, Lodzkie, Poland, 92-213|
|Principal Investigator:||Rafal Pawliczak, MD, PhD||Medical University of Lodz|