2_1_Pubmed_Search_and_Literature_Review.ppt
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This document provides guidance on conducting literature reviews. It discusses what a literature review is, including that it synthesizes existing published work on a topic into a summary. Literature reviews must be organized around a research question and identify gaps. The document also reviews how to systematically search literature databases like PubMed. It emphasizes using a structured search strategy based on population, determinant, and outcome terms along with Boolean operators. Key search tips include using Medical Subject Headings to enhance searches and saving strategies for future use.
![PubMed: What is in it?
As of 8 March 2012 ~ over 21 million
citations for biomedical literature
from MEDLINE, life science journals,
and online books.
As of November 2011, 5,582 in
Medline
Different languages []](https://image.slidesharecdn.com/21pubmedsearchandliteraturereview-230409151013-eedbf4b2/85/2_1_Pubmed_Search_and_Literature_Review-ppt-10-320.jpg)
2_1_Pubmed_Search_and_Literature_Review.ppt
- 2. Acknowledgement Acknowledgment to Assoc. Prof Dr Sharmini Selvarajah and Ms Chun Geok Ying for preparation of the core contents of this presentation.
- 3. Literature review What it is Scientific account of what has already been published on a specific topic What it is not Description or summary of all published information
- 4. Literature reviews must. 1. Be organised around a specific research question/ topic 2. Synthesize information into a summary of what is and is not known 3. Identify areas of uncertainty/ controversy 4. Create questions that need further research
- 5. Literature review Involves two processes 1. Searching for information 2. Critically appraising the literature
- 6. Literature Search using PubMed Acknowledgement: Prof. Geert van der Heijden
- 7. Contents Aim Systematic approach to searching How to use PubMed What not to do
- 8. Aim Time saving Restrict absolute number titles Increase number relevant titles Reduce Numbers Needed to Read
- 9. PubMed: What is it? PubMed is a free database accessing the MEDLINE database of citations, abstracts and some full text articles on life sciences and biomedical topics. http://www.nlm.nih.gov/services/pubm ed.html
- 10. PubMed: What is in it? As of 8 March 2012 ~ over 21 million citations for biomedical literature from MEDLINE, life science journals, and online books. As of November 2011, 5,582 in Medline Different languages []
- 11. Systematic approach to searching What to do and what NOT to do
- 12. Search strategy in PubMed Use knowledge, logic and creativity Start with good Research Question Population Determinant/ Exposure Outcome Have several terms & synonyms for all Be aware: UK / US spelling
- 13. Search strategy Search #1: Population OR synonyms Search #2: Determinant OR synonyms Search #3: Outcome OR synonyms Search #4: Combine #1, #2 and #3 Population (#1) AND Determinant (#2) AND Outcome (#3)
- 14. Basic Search Scheme Population Determinant/ Exposure Outcome term term term Synonym 1 Synonym 1 Synonym 1 Synonym 2 Synonym 2 Synonym 2 Synonym 3 Synonym 3 OR OR OR AND AND
- 15. Boolean operators AND OR NOT Renal Renal Failure Failure
- 16. How to search in PubMed? Use Title/ Abstract in search builder, under Advanced Search tab in Pubmed http://www.ncbi.nlm.nih.gov/pubmed
- 19. Research Question Does renal impairment increase mortality risk in Type 2 Diabetes Mellitus? Population: Type 2 DM Determinant: Renal impairment Outcome: Mortality
- 20. Example Population Type 2 Diabetes Type 2 diabetics Non insulin dependent diabetes OR
- 29. Example Population Determinant/ Exposure Outcome Type 2 Diabetes Renal Mortality Type 2 diabetics Kidney Death Non insulin dependent diabetes Albuminuria/ Albumin Glomerular AND AND
- 32. How to MeSH up your search What NOT to do
- 33. MeSH database Medical Subject Headings (MeSH) Systematic keyword catalogue Related to content 5 MeSH terms per record Based on title and abstract words Partially manual process Misclassification possible MeSH = US spelling
- 34. MeSH database Author keywords: NOT used Only available 3 6 months after publication Adjustment to terms regular Eg. 2007 22 terms removed 494 terms added 99 terms replaced
- 36. What else not to do Use sparingly wildcard/ truncation * Eg. Random* Look at search details Try NOT to use Boolean term NOT
- 38. Additional tips Save search strategy under My NCBI Save/ Email collection on articles
- 41. Nurses and other allied health researchers RQ: What is the level of knowledge and attitudes of nursing students toward tuberculosis? Reason: To understand and determine whether there is a need for improvement in nursing education regarding tuberculosis.
- 42. Research Question What is the level of knowledge and attitudes of nursing students toward tuberculosis? Population: Nursing students Determinant: Level of knowledge and attitudes towards TB Outcome: None
- 48. Practical session Think of a research question and prepare search terms 5 minutes Go through PubMed search together
- 49. Literature search for Qualitative Studies Challenges of search in database: Titles are descriptive c.f. RCT which usually has clear description of population, determinants, outcome and/or research method Eg: Unbearable incidents: Failure to endure the experience of Illness Specific key terms difficult Limited standardisation in presentation of abstract c.f RCT : poor description of study method Poor indexing: inconsistent indexing in Pubmed Complex and difficult!
- 50. Literature search for Qualitative Studies Currently, no establish search strategy for qualitative study Potentially useful method: Use appropriate MeSH terms in search: eg: qualitative research, focus groups, narration, anecdotes, grounded theory, attitude, knowledge, practice Limit search to publication types Use a Quality research filter Pubmed Health services research queries http://www.nlm.nih.gov/nichsr/hedges/search.html Finding Qualitative Research Articles: Pubmed . http://libguides.hsl.washington.edu/c.php?g=99112&p=642322