Sources of medical knowledge (1 october 2012)


Published on

  • Be the first to comment

  • Be the first to like this

No Downloads
Total views
On SlideShare
From Embeds
Number of Embeds
Embeds 0
No embeds

No notes for slide

Sources of medical knowledge (1 october 2012)

  1. 1. Resources of scientific knowledge: the weight of where to search Joost Daams, MA Medical Information Specialist AMC medical library 1 October 2012
  2. 2. IntroductionThe weight…… of WHERE to search:• Internet as resource of medical information• Journals & articles• Books & point of care tools• Catalogs & digital library• Bibliographic databases• Guidelines & other resources of evidence
  3. 3. The weight of WHERE to search …(…HOW to search is a different chapter ☺) Lack of face validity: the curious case of “meat bastards” • Integrity • transparency • reproducibillity (validity) … and evidence
  4. 4. Internet as resource of medical information (1)How physicians get information to diagnose and treat patientsDerived from:, last consulted: 29th September 2012
  5. 5. Internet as resource of medical information (2)What about:• integrity• transparency• reproducibillity (validity)? ?? ??? ? What about: • content • relevance ranking • … and evidence?
  6. 6. Journals & articles (1)The quality of a journal (≈ article) can be assessed by quality indicators:1. Established reputation e.g. Radiology is considered to be the top journal among radiologists, regardless of other quality inidcators2. “Scientometrics” e.g. Journal Impact Factor (JIF), Hirsch-Index, Web “ Sitations”3. Peer-review (y/n)4. ICMJE compliancy (y/n) e.g. ethical considerations in the conduct and reporting of research, guidelines for the publication process as well as the editorial process
  7. 7. Journals & articles (2)More on the Journal Impact Factor (JIF) JIF2011 = A/B• What it is & application A = the number of times articles published in 2009 and 2010 were cited by indexed journals during 2011. B = the total number of "citable items" published by that journal in 2009 and 2010. ("Citable items" are usually• Critique articles, reviews, proceedings, or notes; not editorials or Temporality bias Letters-to-the-Editor.) Geographical/language bias Topicality bias Incentive for self-citations Range of provided subject topics Assignment of journals to topics Poor adaptation of web downloads / web citations Non-transparent journal inclusion criteria by Thomson Reuters Monolithic organisationStrengths “ Impact factor is not a perfect tool to measure the quality of articles but there is nothing better and it has the advantage of already being in existence and is, therefore, a good technique for scientific evaluation. (…) The use of impact factor as a measure of quality is widespread because it fits well with the opinion we have in each field of the best journals in our speciality.” (Hoeffel C. Journal Impact factors. Allergy. 1998;53;1225)
  8. 8. Journals & articles (3)More on the International Committee of Medical Journal Editors (ICMJE)• What it is & application• Important (major?) achievement “The ICMJE member journals will require, as a condition of consideration for publication in their journals, registration in a public trials registry”• … however publication bias is poorly addressed “Editors should seriously consider for publication any carefully done study of an important question, relevant to their readers, whether the results for the primary of any additional outcome are statistically significant.”
  9. 9. Journals & articles (4)Open Access (OA) : a (would-be) idealists’ dream?• What it is & application Golden road or green road? exposure• What it’s not A priori free access (from the authors’ point of view) Already out there for all disciplines A priori (not) peer-reviewed Always protective of author rights• Does OA influence JIF? Further research is needed: only 1 study indicated increased downloads without a necessary influence on clinical practice, but: •` Researchers in the sciences do not see access to the scientific literature as an especially important problem • Authors consider factors such as journal reputation and the absence of publication fees when deciding where to submit their work. In contrast, free access is not a significant factor in their submission decissions. (The impact of free access to the scientific literature: a review of recent research, Davis, Philip M. and Walters, William H. Journal of the Medical Library Association. 2011;99(3);208)
  10. 10. Books & ‘point of care tools’Making a “case” for booksCan exposure to high concentration oftoluene diisocyanate (TDI) cause cognitiveimpairments? ? “ In summary, psychometric testing using the Wechsler memory scale ? (1945) has shown a selective memory defect for relatively long-term recall among the group of firemen who were clinically thought to be still suffering from organic cerebral impairment four years after the fire.” Neurological complications after a single severe exposure to toluene di- isocyanate PAMELA M.LE QUESNE et al. British Journal of Industrial Medicine . 1976;33;72-78
  11. 11. Catalogs & digital libraryCatalogsBibliographic databases !
  12. 12. Bibliographic databasesPubmed ≠ Medline:In addition to MEDLINE citations, PubMed also contains:• In-process citations which provide a record for an article before it is indexed with MeSH and added to MEDLINE or converted to out-of-scope status.• Citations that precede the date that a journal was selected for MEDLINE indexing (when supplied electronically by the publisher).• Some OLDMEDLINE citations that have not yet been updated with current vocabulary and converted to MEDLINE status.• Citations to articles that are out-of-scope (e.g., covering plate tectonics or astrophysics) from certain MEDLINE journals, primarily general science and general chemistryjournals, for which the life sciences articles are indexed with MeSH for MEDLINE.• Citations to some additional life science journals that submit full text to PubMedCentral® and receive a qualitative review by NLM.• Citations to author manuscripts of articles published by NIH-funded researchers.• Citations for a subset of books available on the NCBI Bookshelf (a citation for both the book and each chapter or section of the book).Source: , last consulted 1 October 2012Why search beyond Pubmed?# journals AND med AND psy AND emb uniqueMedline 5,521 2,926Psychinfo 596 2,208 1,402Embase 2,360 571 3,982 1,412Source, revised 11 March 2009
  13. 13. Guidelines & other resources of evidence
  14. 14. Questions?