Active clinical trials for "Respiratory Hypersensitivity"

The study investigates the inspiratory duty cycle in subjects with and without airway hyper-responsiveness both at rest and during a bronchoprovocation challenge. The primary goal is to determine an average inspiratory duty cycle for standard use in the calculation of bronchoprovocation test results.

The prevalence of airway hyperresponsiveness (AHR) is very high in elite swimmers, reaching 80% in certain studies. Repeated Chlorine-derivatives exposure may be a major causative factor for its development. Asthma diagnosis is generally made on the basis of clinical characteristics. The demonstration of a variable bronchial obstruction through positive expiratory flow reversibility to a bronchodilator, spontaneous variations of airway obstruction or a positive provocation test (methacholine, eucapnic voluntary hyperpnoea…) is necessary to avoid false diagnosis. Currently asthma treatment in swimmers is the same as in the general population. A short-acting bronchodilator is often prescribed to avoid occasional symptoms, combined with an inhaled corticosteroid or an antagonist of Leukotriene if asthma symptoms are persistent. Previous studies have shown a reduced efficiency for asthma medication in elite athletes compared with non-athletes. The specific response to different medications remains to be studied in athletes. The effects of a short-acting bronchodilator in swimmers with AHR, especially when asymptomatic, on pulmonary function and performance have not yet been studied. Moreover, the significance of a positive bronchial provocation test remains to be studied in asymptomatic swimmers with AHR.

The purpose of this study is to determine if Xolair can reduce the abnormal increase in limitation to airflow in patients with asthma in a relatively short time period. Another purpose is to determine if Xolair will decrease the amount of inflammation in the lungs of an asthmatic patient in the same time period.

This study has the aim to assess the effectiveness of the Ai Chi method as an adjunct therapy in the treatment of children with asthma.

Certain lung disease medications can influence diagnostic tests and research investigations. This study will investigate how long ipratropium bromide must be withheld before a methacholine challenge test can be conducted. This information will be useful for validating current guidelines.

Alcohol has consequences including increased risk for upper respiratory tract infections, pneumonia, acute respiratory distress syndrome (ARDS), and alcohol-induced asthma. The investigators have established that airways are specifically impacted by alcohol exposure because the airways are heavily exposed to the vapor phase of alcohol during drinking. These preliminary studies demonstrate that brief alcohol administration significantly attenuates airway hyperresponsiveness (AHR) in a mouse model leading to the hypothesis that alcohol exposure modifies airway hyperresponsiveness through a cAMP/NO- dependent mechanism.

Intraoperative bronchospasm challenges anesthesia's safety. This study aims to investigate high concentration of exhaled nitric oxide as a marker of intraoperative bronchospasm.

The purpose of this study is to study differences in small airways (<2mm) parameters in asthma patients, subjects with asymptomatic airway hyperresponsiveness and healthy controls.

Background: Increased serum high sensitivity C-reactive protein (hs-CRP) has been associated with airway inflammation in asthma and may serve as a surrogate marker for the presence of airway hyper-responsiveness (AHR) in this set-up. This study was designed to evaluate the predictive value of hs-CRP for AHR assessed by metacholine challenge test (MCT), in adults with suspected Asthma.

Swimmers show the highest prevalence of asthma among elite athletes, certainly due to chlorine exposure. The consequences of a chronic exposure to chlorine compounds by swimmers and the mechanisms of asthme in this population are still poorly documented. Specific diagnostic criteria have been proposed by the International Olympic Committee - Medical Council (IOC-MC) and World anti-doping agency (WADA) to determine the presence of asthma in athletes. Using the more specific bronchial provocation tests, our aims are to compare the prevalence of asthma in swimmers and control subjects to analyze the Influence of chlorine exposure on bronchial inflammatory processes in swimmers versus control subjects to study the time-course of changes in airway symptoms, responsiveness, inflammation and remodeling after cessation of training