Antileukotriene agents compared to inhaled corticosteroids

25. Medical Subject Headings – Medical Subject Headings is a comprehensive controlled vocabulary for the purpose of indexing journal articles and books in the life sciences, it serves as a thesaurus that facilitates searching. Created and updated by the United States National Library of Medicine, it is used by the MEDLINE/PubMed article database, MeSH is also used by ClinicalTrials. gov registry to classify which diseases are studied by trials registered in ClinicalTrials. gov. MeSH was introduced in 1960, with the NLMs own index catalogue, the yearly printed version of MeSH was discontinued in 2007 and MeSH is now available online only. It can be browsed and downloaded free of charge through PubMed, originally in English, MeSH has been translated into numerous other languages and allows retrieval of documents from different languages. The 2009 version of MeSH contains a total of 25,186 subject headings, most of these are accompanied by a short description or definition, links to related descriptors, and a list of synonyms or very similar terms. This additional information and the structure make the MeSH essentially a thesaurus. The descriptors or subject headings are arranged in a hierarchy, a given descriptor may appear at several locations in the hierarchical tree. The tree locations carry systematic labels known as numbers. The tree numbers of a given descriptor are subject to change as MeSH is updated, every descriptor also carries a unique alphanumerical ID that will not change. Most subject headings come with a description or definition. See the MeSH description for diabetes type 2 as an example, the explanatory text is written by the MeSH team based on their standard sources if not otherwise stated. References are mostly encyclopaedias and standard textbooks of the subject areas, references for specific statements in the descriptions are not given, instead readers are referred to the bibliography. In addition to the hierarchy, MeSH contains a small number of standard qualifiers. For example, Measles is a descriptor and epidemiology is a qualifier, the epidemiology qualifier can be added to all other disease descriptors. Not all descriptor/qualifier combinations are allowed some of them may be meaningless. In all there are 83 different qualifiers, in addition to the descriptors, MeSH also contains some 139,000 supplementary concept records. These do not belong to the vocabulary as such, instead they enlarge the thesaurus. Many of these records describe chemical substances, by default, a search for a descriptor will include all the descriptors in the hierarchy below the given one

Antileukotriene agents compared to inhaled corticosteroids

antileukotriene agents compared to inhaled corticosteroids

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