A word or phrase is automatically matched (or mapped) to its corresponding Emtree thesaurus term, and the search is run in the Disease Index Term and Drug Index Term fields.
Example: ‘Myocardial infarction’ maps to the Emtree term heart infarction, so papers indexed with this term are retrieved. The drug trade name Prozac maps to the preferred generic name fluoxetine.
Mapping is useful for ensuring consistency throughout your search. A concept receives the same index term no matter how it may be expressed within a document. For instance the drug names Valium, Seduxen, Relanium, Psychopax, etc., all refer to the same drug, diazepam. Any article that discusses this drug is indexed with diazepam, no matter what name the article author actually calls it in his/her paper; mapping ensures that no paper discussing diazepam will be missed, no matter what trade name is mentioned.
Mapping can be turned off. In this case, words and phrases are searched as free text.
Enclose multi-word phrases in quotation marks (it doesn’t matter whether they are single or double quotes, as long as they match). If quotes are omitted, each word is mapped separately and unmapped words are searched as free text, and combined with a Boolean AND, resulting in potentially irrelevant hits.
heart attacks is searched as ‘heart’/de AND attacks
Spell check has been built into Emtree to find possible user typing errors and provide corrections. If the term you type is misspelled, Emtree offers a list of possible alternatives. Click on any appropriate suggested term to proceed with the query as usual.
Please refer to our Emtree info page for more information.