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Alumni Medical Library

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Contains the full MEDLINE database, plus Evidence Based Medicine Reviews database ... Am I using the right database, time period, etc. ... – PowerPoint PPT presentation

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Title: Alumni Medical Library


1
Alumni Medical Library Boston University Medical
Center Introduction to MEDLINE Searching
BUMC MEDLINE Plus/OVID

2
Workshop Goals
  • Become familiar with BUMC MEDLINE Plus system
    features and functions
  • Improve basic MEDLINE searching skills
  • Composing searchable questions
  • Executing effective search strategies
  • Identify parts of the citation record

3
The MEDLINEdatabase
4
MEDLINE
  • Produced by the National Library of Medicine
    (NLM) in Bethesda, MD
  • Bibliographic database of citations to journal
    literature in the biomedical sciences
  • Covers all aspects of health care
  • medicine, nursing, allied health fields,
    biomedical and pre-clinical sciences, pharmacy,
    dentistry, psychiatry, etc.
  • Contains all of the materials formerly published
    in the now defunct AIDSLINE, BIOETHICSLINE, and
    HealthSTAR databases

5
MEDLINE
  • Dates from 1966 to the present time
  • Indexes approximately 3900 journals
  • Contains 11 million citations, many with
    abstracts
  • Uses the MeSH (Medical Subject Headings)
    controlled vocabulary thesaurus
  • English language articles comprise 75 - 80 of
    the database
  • Approximately 1-3 months lag time between
    publication and inclusion in database
  • Updated weekly

6
MEDLINE Database VendorsNLM sells MEDLINE to
commercial vendors who mount it on their systems
  • OVID (BUMC MEDLINE Plus)
  • PubMed
  • SilverPlatter
  • DIALOG
  • Avicenna
  • HealthGate
  • Medscape
  • BioMedNet
  • and others...

7
Recommended MEDLINE systems
  • BUMC MEDLINE Plus
  • http//medlib.bu.edu/
  • individual login name and password required
  • available 24/7 on the Web from any computer
    worldwide
  • PubMed
  • http//www.ncbi.nlm.nih.gov/entrez/
  • no passwords required
  • available 24/7 on the Web from any computer
    worldwide

8
BUMC MEDLINE Plus System Features
9
System features
  • Uses the OVID search software
  • Available 24 hours per day, 7 days a week from
    any location worldwide with an Internet
    connection

Go to the librarys web site, and click on the
link to BUMC MEDLINE Plus
10
System Features
  • Updated weekly
  • Contains the full MEDLINE database, plus Evidence
    Based Medicine Reviews database
  • Full and advanced search modes
  • Extensive online help
  • Web-based searching tutorial
  • And a variety of BUMC-personalized options

11
System Features
  • Includes the full text of 100 biomedical journals
  • 100 core, clinical biomedical journals linked
    directly to the search interface
  • includes all graphics, illustrations tables
  • cross-links to authors citations in MEDLINE
  • links between full text and references
  • full printing, e-mailing, and downloading
    capabilities

12
System Features
  • Includes a number of biomedical databases
  • MEDLINE
  • AIDSLINE (1980-2000)
  • BIOETHCLINE (1973-2000)
  • HEALTHSTAR (1975 - 2000)
  • CINAHL (nursing allied health)
  • EVIDENCE BASED MEDICINE REVIEWS
  • Best Evidence
  • Cochrane Database of Systematic Reviews

13
System Features
  • Catalog holdings shows you the volumes, issues,
    and years of each journal that are owned by BU
    libraries
  • Local Holdings option allows you to determine
    which journals are owned by Boston University
    libraries

14
Locating Journal ArticlesHow do I find the
complete article for those not available as full
text online?Catalog holdings holdings option
in MEDLINE lets you see which volumes of each
journal are owned by BU libraries
  • Catalog
  • Use the online catalog to check journal title
    holdings
  • Use the Union List of Serials to determine
    Boston-area library holdings
  • Order articles directly via Interlibrary Loan

15
Locating Journal Articles
  • How do I find the complete article for those not
    available as full text online?
  • Use the online catalog to check journal title
    holdings
  • 1300 printed journal subscriptions
  • 1200 full text electronic journal subscriptions
    on our Web site
  • Use the Union List of Serials to determine
    Boston-area library holdings
  • Order articles directly via Interlibrary Loan

16
TheMEDLINECitation
17
Parts of a Citation Record
  • unique identifier
  • author
  • institution
  • title
  • source (journal, volume, pages, year)
  • MeSH (Medical Subject Headings)
  • abstract
  • drug registry numbers

18
(No Transcript)
19
  • The Search Process

20
Steps in the Search Process
  • 1. Search required field
  • Medical Subject Heading (MeSH) controlled
    vocabulary terms
  • text words (title or abstract words)
  • authors
  • journal titles
  • 2. Combine sets
  • 3. Limit or refine results
  • 4. View evaluate retrieval
  • 5. Print, email, save to disk

21
2. Combine Sets
OR
AND
set includes records containing both terms or
concepts
set includes records containing either term or
concept
22
3. Limit or Refine Results
  • Use limiting factors to refine your search
  • age groups
  • gender
  • publication types
  • randomized controlled trials
  • clinical trials or controlled clinical trials
  • review articles
  • meta analyses
  • english (vs. other languages)
  • human V. animal study populations
  • full text journals
  • local holdings

23
4. View and evaluate search resultsTake a look
at the citations to determine whether you found
relevant informationGet clues to other search
strategies by looking for useful textwords or
subject headings5. Print, download, or email
search results
24
MeSHMedical Subject Headings
25
MeSH
  • MeSH is an acronym for Medical Subject Headings
  • MeSH is the controlled vocabulary or thesaurus
    that represents the subject content of each
    article
  • Over 50,000 MeSH terms with more than 30
    subheadings
  • MeSH are grouped in family hierarchies called
    trees
  • A tree represents each subjects relationship to
    the other subject headings
  • A tree progresses from the most general (broad)
    term to the most specific (narrow) term

26
MeSH Subheadings
  • Subheadings are attached to MeSH to further
    describe the subject.
  • More than 30 subheadings exist
  • Administration Dosage Adverse Effects
  • Analysis Chemically-induced
    Diagnostic use Drug
    Therapy Legislation
    Jurisprudence Pathophysiology
    Pharmacokinetics Prevention
    Control
  • Transmission and others...
  • Example hiv infections/pc
  • (prevention and control of HIV infections)

27
Indexing Searching
  • Indexers at NLM read and index the articles
  • input appropriate data into each field
  • assign 8 - 15 MeSH for each article
  • indexing is done at the level of specificity --
    the most specific available MeSH is used
  • Searchers come to the database with a topic or
    question
  • use field searching to retrieve relevant
    citations
  • decide which MeSH to use in what combination
  • the decisions you make determine what information
    is retrieved

28
MeSH
  • During the search process, you will make a number
    of decisions that will impact your search
    results
  • which MeSH to use for each concept
  • whether to explode term to incorporate other
    terms in the tree
  • whether to focus to articles where that subject
    is emphasized
  • which subheadings to attach

29
The Search ProcessFood for Thought...
30
Search Process
courtesy of Welch Library, Johns Hopkins
University www.welch.jhu.edu/classes/tut/lit-srch/
search.process.html
define question
select information source
NO
formulate query
evaluate results satisfactory?
YES
perform search
record results strategy
31
Search Process
  • Plan your search strategy before you go online
  • Identify key concepts outlined in your topic
  • Identify MeSH subject headings used to represent
    those concepts
  • List common words which describe the concepts and
    can be used for textword searching
  • Determine how to combine those terms
  • refine search with additional terms or limiting
    factors

32
Search Process
  • Searching is an iterative process. Ask yourself
    these questions
  • Why did my search find what it found?
  • How do I know if Ive found everything on this
    topic?
  • What other approaches should I try?
  • Am I using the right database, time period, etc.?
  • Am I using the right textwords or subject
    headings?

33
Understanding and Interpreting Search Results
  • Look at subject headings from a relevant article
  • Look at references from relevant articles
  • Analyze why certain citation were retrieved VS.
    were not retrieved.
  • Try a variety of approaches and combinations
  • Ask a professional searcher (librarian) for
    assistance

34
Potential Causes of Low or Inappropriate
Retrieval
  • Ineffective manipulation of the database
  • MeSH too narrow
  • Subheadings too restrictive
  • Scope of the database
  • Approach or interpretation of the topic
    point-of-view
  • Research population too specific

35
Potential Causes of High or Inappropriate
Retrieval
  • MeSH too broad
  • Subheadings -- select one or two to narrow your
    search
  • Try combining a textword with your existing
    subject search
  • Example look for a particular word in the
    titles of articles (latex allergy).ti.
  • Try using additional limit options such as local
    holdings, full text, age groups, or publication
    year

36
Common Searching Errors
  • Using textword searching (sloppy) instead of MeSH
    (precise)
  • Using the wrong MeSH terms
  • Using too few possibly relevant MeSH terms
  • Failing to EXPLODE the MeSH term
  • Attaching subheadings
  • (Rule select all subheadings rather than one
    or two)

37
  • Comments?
  • Questions?

38
Demonstration
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