Literature search

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2007 Dec 22 @ Taichung CSH

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  • Literature search

    1. 1. 實證醫學 – 查 2007 Dec. 22 @ 中山大學附醫 基隆長庚.楊宗翰醫師 實證醫學中心 & 風濕過敏免疫科 http://ebm.twbbs.org/
    2. 2. Five Steps <ul><li>Ask </li></ul><ul><li>Acquire (Search) </li></ul><ul><li>Appraise </li></ul><ul><li>Apply </li></ul><ul><li>Audit </li></ul><ul><li>問 </li></ul><ul><li>查 </li></ul><ul><li>讀 </li></ul><ul><li>用 </li></ul><ul><li>審 </li></ul>
    3. 3. Ask / 問 <ul><li>精確( specific )的問題 </li></ul><ul><ul><li>可以 被回答 (answerable) </li></ul></ul><ul><ul><li>可以 被搜尋 (searchable) </li></ul></ul><ul><li>P </li></ul><ul><li>I </li></ul><ul><li>C </li></ul><ul><li>O </li></ul>
    4. 4. Appraise <ul><li>Appraised by yourself … </li></ul><ul><ul><li>Time consuming </li></ul></ul><ul><ul><li>Original articles </li></ul></ul><ul><li>Appraised by authorized specialists </li></ul><ul><ul><li>Systems, Synopses, Synthesis </li></ul></ul><ul><ul><li>Review articles (narrative, systematic, EBM review) </li></ul></ul>Dave Sackett
    5. 5. Acquire / 查
    6. 6. Acquire / 查 <ul><li>建構檢索策略 </li></ul><ul><ul><li>Ovid Medline or Pubmed </li></ul></ul><ul><li>選擇資料庫 </li></ul><ul><li>實例 </li></ul>
    7. 7. 搜尋策略 1 - Question <ul><li>那種問題? </li></ul><ul><ul><li>Foreground or Background </li></ul></ul><ul><li>那類問題? </li></ul><ul><ul><li>Frequency (incidence or prevalence) </li></ul></ul><ul><ul><li>Diagnosis </li></ul></ul><ul><ul><li>Harm (etiology or risk factors) </li></ul></ul><ul><ul><li>Prognosis (natural history) </li></ul></ul><ul><ul><li>Treatment (intervention) </li></ul></ul><ul><li>最佳解決方案(研究方法)! </li></ul>
    8. 8. <ul><li>決定 Keywords </li></ul><ul><ul><li>縮寫 </li></ul></ul><ul><ul><ul><li>AMI, BPH, CAP , CAD </li></ul></ul></ul><ul><ul><ul><li>DM , IDA , MM , SLE </li></ul></ul></ul><ul><ul><li>中文 > 英文 </li></ul></ul><ul><ul><ul><li>漢英字典(非醫學 & 醫學) </li></ul></ul></ul><ul><ul><li>Results from searches </li></ul></ul>搜尋策略 2 - Keywords
    9. 10. Keywords or Index Terms <ul><li>keywords </li></ul><ul><ul><li>truncation ($/*; Salmonell* or child$) </li></ul></ul><ul><li>indexed terms </li></ul><ul><ul><li>MeSH (Medline/Pubmed) </li></ul></ul><ul><ul><li>CINAHL Index Terms (CINAHL) </li></ul></ul><ul><ul><li>EMTAGs (EMBASE) </li></ul></ul><ul><li>automatic term mapping (ATM) </li></ul>
    10. 12. Keywords or Index Terms <ul><li>Definition </li></ul><ul><ul><li>Neoplasms </li></ul></ul><ul><ul><ul><li>cancer, carcinoma, tumor </li></ul></ul></ul><ul><ul><li>atherosclerosis </li></ul></ul><ul><ul><ul><li>arteriosclerosis </li></ul></ul></ul><ul><ul><ul><li>arteriolosclerosis </li></ul></ul></ul><ul><li>Relevance (focus or explode) </li></ul>
    11. 13. Atherosclerosis
    12. 14. 1 2 3 2 1 3
    13. 15. MeSH ... <ul><li>Most human beings on the planet who are not librarians don't know anything about how to search with MeSH. </li></ul><ul><ul><li>John Sack, the director of HighWire Press. </li></ul></ul>NEJM 2005;354:1:4-7
    14. 16. 搜尋策略 3 - Hedges <ul><li>1 concept or keyword a line (an entry) </li></ul><ul><li>P & I more important, use C & O to narrow down results </li></ul><ul><li>OR & AND </li></ul><ul><li>NEAR, ADJ … </li></ul><ul><li>! NOT </li></ul>
    15. 17. 搜尋策略 4 - Filters <ul><li>最佳解決方案 </li></ul><ul><li>Quality filters & Limit </li></ul><ul><ul><li>clinical query </li></ul></ul><ul><ul><li>methodology (publication type) filters </li></ul></ul><ul><ul><li>x English, full text, review </li></ul></ul>
    16. 18. Current Best Evidence
    17. 19. Filters - limit <ul><li>therapy, diagnosis, prognosis, etiology, qualitative studies </li></ul><ul><li>review, clinical prediction guides, costs, economics </li></ul><ul><li>sensitivity, specificity, optimized </li></ul>
    18. 20. Acquire / 查 <ul><li>建構檢索策略 - Questions </li></ul><ul><ul><li>keywords > + MeSH > hedges > filters </li></ul></ul><ul><li>選擇資料庫 </li></ul><ul><li>實例 </li></ul>
    19. 21. 49 & 42 個選擇
    20. 22. 36 個選擇
    21. 23. 推薦 10 個 http://ebm.twbbs.org/
    22. 24. One
    23. 25. Best Solution! <ul><li>定期更新 </li></ul><ul><li>資料來源 </li></ul><ul><li>簡單易用 </li></ul><ul><li>更好 </li></ul><ul><li>更聰明 </li></ul><ul><li>更簡單 </li></ul>
    24. 26. Acquire - Which & Why? <ul><li>Contents </li></ul><ul><li>How to search? </li></ul><ul><li>Results of search? </li></ul><ul><li>Google </li></ul><ul><li>MSN </li></ul><ul><li>Yahoo </li></ul>
    25. 27. Acquire - Which & Why? <ul><li>Contents (original, EBM review, review) </li></ul><ul><li>How to search? </li></ul><ul><ul><li>Keywords OR thesaurus/MeSH </li></ul></ul><ul><ul><ul><li>Synonymy/acronym; </li></ul></ul></ul><ul><ul><ul><li>Query interpretation (heart attack cancer) </li></ul></ul></ul><ul><ul><li>Search strategy </li></ul></ul><ul><ul><ul><li>Boolean logics (AND/OR/NOT/NEAR) </li></ul></ul></ul><ul><ul><ul><li>Categories & filters (quality & publication types) </li></ul></ul></ul><ul><ul><li>Search refinements </li></ul></ul><ul><ul><ul><li>Diagnosis, Differential diagnosis, etiology, pathogenesis, prognosis, signs, symptoms, treatment </li></ul></ul></ul><ul><ul><ul><li>Population, disease entity (hypertension – pregnancy, portal, pulmonary, renal…) </li></ul></ul></ul><ul><li>Results of search? </li></ul><ul><ul><li>Numbers of results – sensitive or specific </li></ul></ul><ul><ul><li>The order of results – time (current), relevant (best?), clinically appropriate (definition?) </li></ul></ul>
    26. 28. http://ebm.twbbs.org/
    27. 29. Contents – 5s <ul><li>Original articles </li></ul><ul><ul><li>Medline (citation) </li></ul></ul><ul><ul><li>Core clinical journals (full text) </li></ul></ul><ul><li>EBM reviews </li></ul><ul><ul><li>Systematic reviews … </li></ul></ul><ul><ul><li>Guidelines </li></ul></ul><ul><li>Reviews </li></ul><ul><ul><li>Textbooks </li></ul></ul><ul><ul><li>Review articles </li></ul></ul><ul><li>更新頻率 </li></ul><ul><li>Cochrane library </li></ul><ul><li>Clinical Evidences </li></ul><ul><li>EBM synopses </li></ul><ul><li>Uptodate & DynaMed </li></ul><ul><li>ACP medicine & PIER </li></ul><ul><li>[email_address] </li></ul>
    28. 30. All in One <ul><li>MD Consult </li></ul><ul><li>Clinical Resources @ OVID </li></ul><ul><ul><li>Clin-eguide </li></ul></ul>
    29. 31. … Peer review journal Review ? (Clin-eguide ?) ? (Clinics – 1 month) Update … Drug – F&C Dx Info Patient education, … Drug - Gold Standard More Semantic or Traditional Smarter, Easier, Better Search & Result Books ($, 61) Clin-eguide Textbook ( 51 ) Review (Clinics – 35 ) First Consult Reviews All EBMR (Cochrane, DARE, ACP …) & Guidelines (2) EBM Journal (?3) Guidelines EBM reviews Medline & CINAHL Full text ($) Medline Core Journals ( 53 ) Original articles [email_address] MD Consult Contents
    30. 32. Critical Appraisal for DBs 建構檢索策略 > 選擇資料庫 > 實作 Case 1 – 胃內水球 & 肥胖 Case 2 – Extra & 蛀牙
    31. 34. Summary - Acquire / 查 <ul><li>建構檢索策略 </li></ul><ul><ul><li>keywords > + MeSH > hedges > filters </li></ul></ul><ul><li>選擇資料庫 </li></ul><ul><ul><li>content > search > result </li></ul></ul><ul><li>實例 </li></ul><ul><ul><li>Case 1 – 胃內水球 & 肥胖 </li></ul></ul><ul><ul><li>Case 2 – Extra & 蛀牙 </li></ul></ul>
    32. 35. Current Best Evidence
    33. 38. Summary <ul><li>Contents (original, EBM review, review) </li></ul><ul><li>How to search? </li></ul><ul><ul><li>Keywords OR thesaurus/MeSH </li></ul></ul><ul><ul><li>Search strategy </li></ul></ul><ul><ul><li>Search refinements </li></ul></ul><ul><li>Results of search? </li></ul><ul><ul><li>Numbers of results </li></ul></ul><ul><ul><li>The order of results </li></ul></ul>
    34. 39. One
    35. 40. Databases <ul><li>Background questions </li></ul><ul><ul><li>Reviews </li></ul></ul><ul><ul><ul><li>MD Consult (Textbooks, Clinics) </li></ul></ul></ul><ul><ul><ul><li>Ovid (Books@Ovid, Journals@Ovid) </li></ul></ul></ul><ul><ul><ul><li>Uptodate </li></ul></ul></ul><ul><li>Foreground questions </li></ul><ul><ul><li>High quality topics review in Clinics, Textbooks & Uptodate (may not be EBM style) </li></ul></ul><ul><ul><li>First Consult, Clin-eguide (Ovid), ACP Pier, Dynamed </li></ul></ul><ul><ul><li>EBM-style review or CATs </li></ul></ul><ul><ul><li>Hand searches </li></ul></ul>
    36. 41. Acquire / 查 <ul><li>建構檢索策略 </li></ul><ul><li>選擇資料庫 </li></ul>
    37. 42. Summary - Acquire / 查 <ul><li>formulate your question </li></ul><ul><li>choose the appropriate database </li></ul><ul><li>select the best Medical Subject Headings (MeSH or index terms) and textwords to describe your topic </li></ul><ul><li>search each concept separately </li></ul><ul><li>combine the terms or sets </li></ul><ul><li>limit your retrieval to appropriate references. </li></ul>

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