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Medical Information Literature Search : PubMed
Bordin Sapsomboon 20 Aug 2018 http://www.si.mahidol.ac.th/simi bordin.sap@mahidol.ac.th
Objectives
Know Medical informatics
Literature search : PubMed
PICO Approach
Do Searching : PubMed
Keywords formation
Advanced level : MeSH, PICO
Evaluation 2
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Why Search for Medical Information ?
5 Roles (Medical Informatics)
Life-long learner Clinician Researcher Teacher/Communicator Manager
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Speak Google’s Language
Latest mobile phones
Models of 2018
I don’t want Samsung Phones
Brain cancer vs “Brain cancer”
Mobile Phone AND Brain Cancer
site:harvard.edu
Image search
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คนหา
รปและชอพลบพลา รพ.ศรราช (Eng) ขนาดแบตเตอรทนาขนเครองบนได วนออกตรวจอ.รงนรนดร รพ.ศรราช ขาวทมดชนนาตาลตา (Low GI) รานอาหารอสานแถวปนเกลา เสนทางจากศรราชไปไบเทค ตวเครองบนราคาถก
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Image Search : Camera
Mobile phone https://reverse.photos/
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What is Information ?
Information vs Medical Information
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Information Source
Document Journal article
Research paper
Newspaper
Magazine
E-document Web : Google
E-Journal : Publisher
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Databases
Internet Database Newspaper
Public database
Literature Database PubMed Ovid
OCLC
Science Direct
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Siriraj Medical Library Databases
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Literature Search
Text matching Word or Words
All documents contains the word “SARS” any where
Keywords Synonyms
All documents about “SARS”
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Strategies for Literature Search
Number of Items Found Too many v.s. Too few
Relevancy Broad v.s. Specific
Relevant v.s. Irrelevant
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Search Tools
Boolean operators AND, OR, NOT, ( )
Fields in article / database Title, Abstract, Author, UI number
MEDLINE database Filter - Limit
Medical Subject Headings
(MeSH)
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Strategies : Broaden
Synonym AIDS, HIV
Thesaurus Infant, Toddler
Boolean operator Pepsi OR Coke
Heading automobile
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Strategies : Narrow
More keywords Red blood cell diseases
Boolean operator AIDS AND Thailand
Thalassemia NOT THAILAND
Heading radiotherapy (only)
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Relevancy
Find “SARS and Cause”
“AIDS in Children”
“Lung cancer and radiotherapy”
“Mobile phone in 2017”
“All articles about lung cancer”
“All articles by Dr. Robinson”
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Strategies : Relevancy
Broaden and Narrow-down
Database tools Limits : AIDS in English language
Query language
MeSH
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Database Query
Find “lung cancer”
"lung neoplasms"[MeSH Terms] OR lung cancer[Text Word]
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MeSH
Medical Subject Headings
Heading Diseases
Subheading Virus Diseases
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MeSH : Example
Virus Diseases
RNA Virus Infections Nidovirales Infections
• Coronaviridae Infections
– Coronavirus Infections
[C02.782.600.550.200]
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Clinical Questions
Background question General question
Ans: Overview, Review, EMB, standards, therapy
Foreground question Complex / patient-centered question
Approach: PICO
(formulating clinical queries)
PICO
Patient / Problem
Diagnosis
Intervention
Diagnostic test
Comparison / Control
Outcomes / Effects
Prognosis
Methodology
Prevention / therapy
PICO : Example (1)
There is a section of town which has a high prevalence rate of obesity and diabetes. There are many churches in that area so you decide to work with the churches to develop a series of interventions to reduce both obesity and diabetes. One of the programs will target foods served at church-sponsored events which are mostly pot-luck.
https://sph.uth.edu/charting/handouts/ebph_handouts/pico.pdf
PICO : Example (2)
Population: members of a group of churches in an area of town
Intervention: program designed to improve types of foods served at church-sponsored events
Comparison: foods served before the intervention
Outcome: Are more nutritious foods served at church-sponsored events after the intervention?
Found Documents Relevant Documents
Relevant Found
Document Space
Existing Documents Search Strategy
Word
Keywords
Operator
MeSH
Multiple resources
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Relevant Documents
Matching Perfect
Partial
Scoring / Ranking 100% = “Perfect” matching
Calculation Frequency of the search word
appeared in the document
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SARS
SARS SARS
Bird Flu
Document Space
Relevant Documents 47
Relevant Information Source
Use relevant information source!
Medical information MEDLINE database
www.pubmed.org
General information Start with good search engines ?
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