Mẹo về Systematic review search strategy Mới Nhất
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Controlled vocabularies (such as the MESH subject headings used in Medline and EMTREE subject headings used in EMBASE) provide an organised approach to the way knowledge is described.
Their use is extremely important as they bring uniformity to the indexing of publications included within a database. Using the same terminology throughout a database creates consistency and precision and helps you to find relevant information no matter what terminology the author may have used within their publication.
Indexing is usually a manual process. Databases such as MEDLINE employ specially trained indexers to read the full-text of each publication then identify all of the concepts covered within the article. These concepts are then translated to the controlled vocabulary used within the database. It is the indexers job to ensure that each concept included in the article are identified and assigned a term.
Each database may use different subject headings to describe the same concept. As an example, the term complementary medicine:
The MESH heading (MEDLINE) is complementary therapiesThe EMTREE heading (EMBASE) is alternative medicineThe CINAHL heading is alternative therapies
The OVID (MEDLINE, EMBASE, AMED, PsycINFO, etc) and CINAHL databases provide a search option to explode terms. Exploded searches retrieve indexed records for a term, plus other terms which are a derivative (more specific, narrower terms) of the search term. Exploding search terms provides a fast way to find related concepts in a single search.
For example, if a search for “complementary therapies” in MEDLINE was exploded:
The search results would also include records indexed with the MESH headings acupuncture, anthroposophy, auriculotherapy, and so on.
NOTE: Clicking on a MESH heading will display its tree, including the exploded terms.
Keyword searches are extremely important when conducting systematic reviews, and should be used in combination with the relevant subject headings within each of your database searches:
- Authors may not describe their methods or objectives well and indexers are not always experts in the subject areas
- The available indexing terms might not correspond to the terms the searcher wishes to use.Cochrane Handbook for Systematic Reviews of Interventions(2011, Section 6.4.5)
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