Emtree is the collection of standardized keywords in Embase.
Searching with an Emtree term will return (all) publications on a certain topic, irrespective of the author's choice of words.
Example: Searching with the Emtree term pollen allergy will find all articles on pollen allergy, even if it is described as 'hay fever' or 'pollen sensitivity' in the article. If you were to search for the word pollen allergy, you would miss these articles.
A sensitive search strategy in Embase is built up by Emtree term searches and searches by word (See the next page: Search by Word).
In the Advanced Search, the option Map Term to Subject Heading is checked by default, which will direct Embase to search for relevant Emtree terms. As an example we will look up 'influenza'.
Next, Embase displays a list of Emtree term suggestions. Choose the Emtree term that best suits your topic. By clicking on the Emtree term, you are directed to a new page with more information on this Emtree term (thesaurus).
The thesaurus shows additional information about an Emtree term:
By browsing the broader and narrower terms, you can sometimes find a more suitable Emtree term and/or find additionally relevant Emtree terms.
Subheadings are perspectives to limit an Emtree term. For a first exploratory search we do not recommend the use of subheadings. If you do not check any subheading, Embase will include all subheadings.
Click on Search History to display previous searches. Emtree terms are indicated by a slash / at the end of the word or phrase. The exp before an Emtree term indicates that all narrower terms are also included in the search (See tab: 3. Thesaurus).
Additionally, if you know the desired Emtree term, you can also search directly with the Emtree term by typing for example exp influenza/ in the search bar.
Watch the video above for a demo on how to search with thesaurus terms (such as Emtree) on the Ovid platform. This video takes MeSH in MEDLINE as an example, but the concept is the same for Emtree in Embase. The demo can also be played in full screen mode.