searching the literature_thawani
TRANSCRIPT
Biomedical information retrieval using PubMed ®
Your money!
• Lunch Money - Rs 65• Stationary - Rs 31• Certificate - Rs 04
• Total - Rs 100
Instructions
• Use the computer as and when instructed to
• No other use of the computer is permitted during the workshop
Learning Objectives
By the end of this session, you should be able to:
• Understand how PubMed translates basic searches.
• Use MeSH and Limits to refine your search.
• Understand and use Boolean operators.
• Develop a search strategy.
• Download and email citations
You have to search a thesis topic on types of drug and diet therapy for skin cancer
Search the web to see what has been already done on this topic
Information Overload
Try PubMed ®
Looking at all the wrong places Retrieval of core information
How do I access PubMed?
Directly at: http://pubmed.com
Or, National Library of Medicine’s homepage: http://www.nlm.nih.gov
Copyright ©2006 AlphaMed Press
Vincent, B. et al. Oncologist 2006;11:243-251
Figure 1. Illustration of how information is stored in the MEDLINE database
Try PubMed
Avoid Stopwords
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Superfluous words
typesofandfor
What is a Search Strategy?
– A plan that helps you look for the information you need. • Search Strategy Tips
– Pick a search topic– Divide topic into concepts – Find words (keywords) or subject headings (MeSH) to
represent these concepts – Refine your search to dates, study groups, etc., as
appropriate. (Limits)– Combine concepts with Boolean (AND, OR, or NOT)
connectors
Types of drug and diet therapy for skin cancer
Patient population (Not defined)Intervention/therapy (Drug & Diet therapy)Comparison (Not applicable), and Outcome (Skin cancer)
• Find out the MeSH word for ‘Skin Cancer’
What is MeSH?
• MeSH – Medical Subject Headings• Controlled vocabulary terms
» Epistaxis, Brain Edema, Otitis Media, Myocardial Infarction
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Click MeSH Database12:14 AM
Select Limits
Click to apply limits.Search
Results are reducedfrom 4,224 to 64
Click Display Settings
Select Abstract and click Apply
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Selected results can also be sent to a clipboard area. Select Send to Clipboard from the dropdown menu.
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Building Blocks(Boolean Operators)
Always use in UPPERCASE12:14 AM
AND narrowsOR broadensNOT excludes
Copyright ©2006 AlphaMed Press
Vincent, B. et al. Oncologist 2006;11:243-251
Using the Boolean operator AND between search terms returns only records that contain all of the search terms
22,18770 2,790502,02152
Copyright ©2006 AlphaMed Press
Vincent, B. et al. Oncologist 2006;11:243-251
Using the Boolean operator OR between search terms returns all records that contain any of the search terms
Copyright ©2006 AlphaMed Press
Vincent, B. et al. Oncologist 2006;11:243-251
Using the Boolean operator NOT between search terms returns only records that contain the first search term and not the second
Default Functions of PubMed
• If no boolean between words, it assumes ‘AND’salmonella hamburger = salmonella AND
hamburger• If anything is written in WORD Alphabet (s) form, it assumes author gupta p shah d• If journal name or pubmed version is typed, it searches it only in
the journal gupta p shah d lancet
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Exercise 1
Impact of daily vs weekly supplementation of iron and folic acid on hemoglobin status
Impact of daily vs weekly supplementation of iron and folic acid on hemoglobin status
Exercise 2
• Use MeSH Database to build a strategy that will find citations to articles about Statistics of Measles Outbreak.
• Measles and Outbreak should be the major topics of the articles.
Exercise 3
Your supervisor asks you to find an article he read in JAMA or New England Journal of Medicine about “Virtual colonoscopy” written by Mitka M.
Exercise 4
• Find citations to articles about the ethics of kidney transplantation.
• Filter to review articles. • Select 5 items and add them to the Clipboard.• Go to the Clipboard and view the selected
items in Abstract format and email the citations to your account.
Where PubMed lacks?
Local, cultural scientific research Non-indexed journals
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Practice makes a man perfect