PubMed Indexing 2012

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A presentation for the journal club

A presentation for the journal club

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  • PubMed is designed so that you can type in significant words into the search box. Be selective about what conceptsrepresent your topic.No punctuation, connectors or quotation marks are needed. In fact, it is best not to use them.
  • Your results are displayed in PubMed’s summary format 20 citations per page and sorted by when the citation made it into the database.The most recently added records appear at the topPage through your results using the navigation at the top rightYou can change your display options (for example, see multiple abstracts on one page or change the sort orderYou can send records to a file, to e-mail, or save them in a collection or in your own bibliography
  • Best features in a PubMed search …?Automatic term mappingAutomatic explosionCitation sensorAnd…

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  • 1. A look at PubMed Indexing:VGH Robert Ho Research Centre, Journal ClubDean Giustini | UBC Biomedical Branch Librarian | June 20th 2012 A talk for researchers at the RHNH Research Centre Vancouver Canada 1
  • 2. By the end of this session, you will be able to:  Describe the types of content in PubMed/MEDLINE  Explain what medical subject headings (MeSH) are  Discuss the pros / cons of indexing with MeSH  How indexing relates to precision, recall, specificity, sensitivity … finding authoritative medical evidence in the biomedical literature
  • 3. What is Medline?• What time period does it cover?• How is it organized?• Why is it important? 3
  • 4.  MEDLINE is a database of citations to the medical literature 5,600 journals indexed from 1966 to present  Journals approved by a review committee NLM indexers use Medical Subject Headings (MESH) to index 50,000 articles a month In 2012, MEDLINE has 22 million citations back to mid-1940s High % of English-language items / all have English abstracts 4
  • 5. Literature Selection & Technical Review Committee (LSTRC) LSTRC is made up of medical experts & librarians Examines hundreds of medical titles yearly Selects 20-25% of reviewed titles Arranges for indexing, XML, NLM loading Done by NLM librarians in Bethesda MD 5
  • 6. • Access, preservation issues• Indexing should describe & collocate• XML tags for web presentation• Preservation components, PubMedCentral• OLDMEDLINE currently on hiatus http://www.nlm.nih.gov/bsd/policy/ejournals.html
  • 7. PubMed as of 2012 http://www.pubmed.gov/ 7
  • 8. A MEDLINE RECORD: Journal name Article title Authors/1st author info Abstracts Language PMID (indexed?) Publication types Medical Subject Headings  Major & minor topics Subheadings Substances 8
  • 9. FACTs:• MeSH (Medical Subject Headings) = Medline’s controlled vocabulary• Describe journal content• Aid in informational retrieval• Indexers assign most specific terms 9
  • 10. Subheadings coordinate with MeSH for specificity= major descriptors get an *asterisk Subheadings coordinate with MeSH = /immunology /pathology 10
  • 11. 11
  • 12. includes:• records for online books & chapters• out of scope articles 12
  • 13. http://www.pubmed.gov/aids drugs breast feeding 13
  • 14. 14
  • 15.  Automatic term mapping Automatic explosion Citation sensor New filters, left hand side Links to the open web PubMed mobile http://www.nlm.nih.gov/mobile/ 15
  • 16. PubMed uses Automatic Term Mapping…which recognizes thousands of concepts & maps to the most appropriate terms … http://www.pubmed.gov/ ATM checks these fields for mapping properly  Medical subject headings Journal titles Authors 16
  • 17. http://www.pubmed.gov/17
  • 18. Summary MEDLINE’s database of biomedical research is the heart of PubMed Includes quality journals seen as important by experts MEDLINE can be searched freely via PubMed; also on other systems MEDLINE is enhanced by Medical Subject Headings (MeSH), which improve access to literature, enhance searching & preservation Dean Giustini | UBC Biomedical Branch Librarian | June 20th 2012 A talk for researchers at the RHNH Research Centre dean.giustini@ubc.ca 18