The Long-term Prognosis of Moderate to Severe Bronchial Hyperresponsiveness (BHR) in Asthmatic Preschool Children
Summary
The aim of investigator´s clinical trial is to investigate 52 patients aged three to five years with viral-induced asthma and 52 patients aged three to five years with allergic asthma. Over a time-span of 5 years the investigators will explore lung function and bronchial responsiveness. The investigators plan to evaluate long-term clinical history of moderate to severe bronchial hyperresponsiveness in preschool children with asthma. Therefore factors like atopy in children, parental atopy and bronchial hyperresponsiveness will be explored.
Description
A positive family history with prevalence of atopy, eczema, wheezing are well-known factors predicting asthma. Caudri et al found more important predictors like perinatal transmission, parental use of inhalative medications and wheezing/dyspnea out of viral infections(5). Measurement of BHR in children was in most studies a second outcome parameter.
Four visits will be performed, baseline and after 1, 3, and 5 years. At visit 1 the investigators will characterize all patients by a ISAAC survey. At each visit in children a methacholine challenge, a skin Prick test, eNO, RAST and total IgE will be performed. At visit 3 and 4 sputum will be induced. In parents only at the first visit a methacholine challenge will be performed. A genetic identification of ADAM33 gene from EDTA blood shall be provided. ADAMs are multidomain proteins with a metalloprotease domain, associated with airway remodelling. Visits should be kept in a time interval without asthma therapy and respiratory infection.
To examine the feasibility of methacholine challenges in preschool children data rised in 2006 will be analysed.
Study Design
Observational Model: Cohort, Time Perspective: Prospective
Conditions
Intrinsic Asthma
Intervention
methacholine bronchial challenge, methacholine bronchial challenge
Location
Goethe University
Frankfurt am Main
Germany
60590
Status
Not yet recruiting
Source
Johann Wolfgang Goethe University Hospitals
Results (where available)
Links
- Source: http://clinicaltrials.gov/show/NCT01144910
- Information obtained from ClinicalTrials.gov on July 15, 2010
Medical and Biotech [MESH] Definitions
Bronchial Provocation Tests
Tests involving inhalation of allergens (nebulized or in dust form), nebulized pharmacologically active solutions (e.g., histamine, methacholine), or control solutions, followed by assessment of respiratory function. These tests are used in the diagnosis of asthma.
Methacholine Compounds
A group of compounds that are derivatives of beta-methylacetylcholine (methacholine).
Methacholine Chloride
A quaternary ammonium parasympathomimetic agent with the muscarinic actions of ACETYLCHOLINE. It is hydrolyzed by ACETYLCHOLINESTERASE at a considerably slower rate than ACETYLCHOLINE and is more resistant to hydrolysis by nonspecific CHOLINESTERASES so that its actions are more prolonged. It is used as a parasympathomimetic bronchoconstrictor agent and as a diagnostic aid for bronchial asthma. (From Martindale, The Extra Pharmacopoeia, 30th ed, p1116)
Bronchial Arteries
Left bronchial arteries arise from the thoracic aorta, the right from the first aortic intercostal or the upper left bronchial artery; they supply the bronchi and the lower trachea.
Metaproterenol
A beta-2 adrenergic agonist used in the treatment of ASTHMA and BRONCHIAL SPASM.
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PubMed Articles
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Usefulness of Exhaled Nitric Oxide for Diagnosing Asthma.
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