View clinical trials related to Asthma.
Filter by:This is a retrospective cohort study of children included in a large medical insurance claims database.
The objective of this study is to determine the effect of cigarette smoking on inflammatory cell recruitment to the lungs after an allergen challenge, in non-smoking and currently smoking mild asthmatic subjects. When comparing non-smoking asthmatics to smoking asthmatics, do differential cell counts obtained from inflammatory cells in induced sputum after allergen challenge differ? Will differential cell counts show a decline in inflammatory cells in the induced sputum of asthmatics who have refrained from smoking for eight weeks? This study is a randomized, case-controlled study. The first part of the study requires smoking and non-smoking subjects who will attend 2 study periods of 3 consecutive days (triad). In each triad, they will be challenged with allergen or diluent by inhalation, in a random order, and each triad is separated by a washout period. In the second part of the study, current smokers will be invited to undergo another allergen challenge 8 weeks of smoking cessation.
Summary: A picture is emerging of dendritic cells migrating through the blood to the airways following allergen inhalation in atopic asthmatics. Although the Koh and McCarthy articles present novel findings, both do not provide a comprehensive view of sputum DCs following allergen challenge. Therefore, the proposed study will examine the kinetics of mDCs and pDCs in the induced sputum of atopic asthmatics following inhalation of allergen. Hypothesis: Following allergen challenge, sputum myeloid and plasmacytoid DCs will migrate into the airway lumen in atopic asthmatics during the timeframe of the late asthmatic response. Objective: The objective of this study is to examine the kinetics of dendritic cells in induced sputum following allergen challenge in atopic asthmatic subjects.
A combination of the corticosteroid GW685698X and the long-acting ß2-agonist GW642444M is being developed for once daily administration for the maintenance treatment of asthma and COPD. GW642444M and GW685698X will be simultaneously co-administered from a single device and compared with GW642444M and GW685698X administered separately in order to determine whether co-administration affects the safety, tolerability, pharmacodynamic and/or pharmacokinetics of either compound in healthy Japanese subjects.
This study was intended to demonstrate that patients with standard and high immunoglobulin E (IgE) levels can be protected from allergen induced broncho-constriction by Xolair
This study will explore information on whether changing the salt formulation of indacaterol affects the incidence of post-inhalation cough.
The primary goals of this study will be to implement innovative processing and detection assays to qualify induced sputum measurements of markers of allergen-induced airway inflammation. The results of this study are intended to form a platform to be used in the clinical development of novel asthma therapeutics.
The purpose is to determine if: 1) Escitalopram treatment will be associated with less oral corticosteroid use than placebo in outpatients with severe asthma and moderate or severe major depressive disorder (MDD). 2) Escitalopram treatment will be associated with greater improvement in asthma symptoms than placebo in outpatients with severe asthma and moderate or severe MDD. 3) Escitalopram treatment will be associated with greater depressive symptom remission rates than placebo in outpatients with severe asthma and moderate or severe MDD.
This is a clinical study that is designed to study the effects of the supplemental intake of enriched omega-3 polyunsaturated fatty acids (fish oil) in patients with moderate to severe asthma. Some asthmatics produce a large amount of inflammatory leukotriene proteins—proteins that contribute to wheezing and inflammation in the airway. Inhibiting the detrimental effects of leukotrienes is a key goal of controller therapy in severe asthmatics. Some asthmatic patients appear to have specific mutations of the arachidonate 5-lipoxygenase (ALOX5) gene, one gene that regulates the production of the inflammatory leukotrienes. Omega-3 fatty acids can interfere with the arachidonic acid pathway and decrease the production of leukotrienes, and this may benefit moderate and severe asthma patients. Our hypothesis is that omega-3 fatty acid supplements, added on to a patient's asthma medication regimen, can decrease the number of minor asthma exacerbations compared to patients who do not receive the supplement. Furthermore, we believe that asthma patients with specific ALOX5 gene mutations will benefit most. We will enroll 30 asthma subjects to take part in this trial. They will undergo genotyping of the ALOX5 gene and be treated with omega3-fatty acids (fish oil) and placebo over a nine month period. We expect that this strategy will allow us to discover which moderate and severe asthma patients will benefit most from supplements of omega-3 fatty acids. Treatment of chronic diseases, such as asthma, is a key mission of the Center of Health and Nutrition Research.
Despite the development of effective medications for treatment, asthma remains a significant contributor of morbidity, mortality, and financial hardship to patients with the disease. An estimated 300 million people worldwide have asthma, making it one of the most common chronic diseases in the world. Asthma accounts for 250,000 deaths per year worldwide, and 1.7 million emergency room visits per year in the United States. Cost of asthma in the United States was an estimated $12.7 billion dollars per year in 1998, and the prevalence is increasing. In 2002, there were 13.9 million outpatient asthma visits to private physician offices and hospital outpatient departments, and 484,000 asthma hospitalizations. Children 5-17 years of age missed 14.7 million school days, and adults missed 11.8 million work days due to asthma in 2002. There is no single diagnostic test or symptom that defines asthma. Asthma is a syndrome consisting of a constellation of symptoms that include wheeze, cough, shortness of breath, and chest tightness. The diagnosis of asthma takes into account history, physical examination findings, and objective measures of pulmonary function and markers of inflammation. In many cases the diagnosis is not in question, allowing for early recognition and appropriate treatment. In other cases, confounding factors makes the diagnosis both challenging and time consuming for the physician and the patient. According to the National Asthma Education and Prevention Program Expert Panel Report 2, asthma is defined as: "a chronic inflammatory disorder of the airways in which many cells and cellular elements play a role, in particular, mast cells, eosinophils, T lymphocytes, macrophages, neutrophils, and epithelial cells. In susceptible individuals, this inflammation causes recurrent episodes of wheezing, breathlessness, chest tightness, and coughing, particularly at night or in the early morning. These episodes are usually associated with widespread but variable airflow obstruction that is often reversible either spontaneously or with treatment. The inflammation also causes an associated increase in the existing bronchial hyperresponsiveness to a variety of stimuli." Airway obstruction and reversibility is measured by pulmonary function testing before and after inhalation of a short acting beta agonist. Airway hyperresponsiveness is measured by methacholine challenge. Estimates of asthma prevalence are generated by the use of written questionnaires in epidemiologic studies. , One of the difficulties with reliance on questionnaires is that patients often misinterpret the questions or fail to answer the question altogether. In this study, a physician will review the questionnaire with the patient in order to clarify each question. The goal in this study is to evaluate a simplified set of questions that can be easily implemented into clinical practice that will predict the presence or absence of asthma. Hypothesis A simplified questionnaire will predict asthma in adults. Study Objectives § Primary Objective o To evaluate the predictive value of a questionnaire designed to diagnose asthma in adults