Internet resources for evidence based practice
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Internet Resources for Evidence-Based Practice. Ben Skinner KnowledgeShare. Individual Clinical Expertise. Evidence-Based Practice. Patients’ Values & Expectations. Best External Evidence. Essentials of evidence-based searching. Understanding of Well structured clinical question

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Internet resources for evidence based practice

Internet Resources for Evidence-Based Practice

Ben Skinner

KnowledgeShare


Internet resources for evidence based practice

Individual Clinical Expertise

Evidence-Based Practice

Patients’ Values & Expectations

Best External Evidence


Essentials of evidence based searching

Essentials of evidence-based searching

Understanding of

  • Well structured clinical question

  • Appraised / Non-appraised resources

    • Reviews

    • Guidelines

    • Digests

  • Hierarchy of evidence

  • Critical appraisal


Clinical questions

Clinical questions

  • Patient / Population:

    • Includes demographics and condition / disease

  • Intervention / Indicator:

    • Which intervention, treatment or approach should be used?

  • Comparison:

    • What is the main alternative to compare with the intervention?

  • Outcome:

    • What are the important outcomes for the patient?


Example of pico

Example of PICO

  • Patients:In a middle-aged man with high blood-pressure…

  • Intervention: … does supplementing the diet with fish oil…

  • Comparison: … in comparison with doing nothing…

  • Outcome: … reduce the risk of cardiovascular disease?


Appraised vs non appraised resources

Appraised vs Non-appraised resources

  • Tertiary evidence

    • Clinical guidelines, Systematic Reviews

  • Secondary evidence

    • Critically appraised digests of primary research

  • Primary evidence

    • Original studies or trials


The problems of peer review

The problems of peer review

  • Fails to identify flawed literature reviews

  • Fails to detect statistical problems and bias

  • Open to abuse by rival researchers

  • Positive publication bias may overestimate the benefits of treatments by up to 1/3


Clinical guidelines

Clinical guidelines

  • Be critical

    • Well structured questions

    • Transparent methodology

    • Multidisciplinary groups

    • Evidence and recommendation grading

    • Open peer review process

    • Easy to navigate


Guideline sites

Guideline sites

  • National Library for Health Guidelines:www.library.nhs.uk/guidelinesfinder

  • National Guideline Clearinghouse:www.guideline.gov

  • OMNI:www.omni.ac.uk

    (For guidelines - click advanced search and specify: “Practice guidelines” in Resource type)


Basic search techniques

Basic search techniques

  • Enter as many terms into the search box as you wish - It retrieves the guidelines in which all the terms occur

  • Search for a phrase by using quotes

    • E.g. “myocardial infarction”

  • You can use brackets and logical operators

    • E.g. (“myocardial infarction” OR MI) AND thrombolysis

  • You can truncate words with the * symbol

    • E.g. thrombo* would find thrombolytic, thrombolysis etc


National library for health guidelines finder http www library nhs uk guidelinesfinder

National Library for Health Guidelines Finderhttp://www.library.nhs.uk/guidelinesfinder/


National guidelines clearinghouse http www guideline gov

National Guidelines Clearinghousehttp://www.guideline.gov


Cochrane library for systematic reviews

Cochrane Library for systematic reviews

  • A set of databases that contains reliable evidence about the effectiveness of interventions:

    • Treatment

    • Diagnosis and screening

    • Health promotion

    • Organisation of care

  • Be critical

    • Check date of last update

    • Check scope of review


The cochrane library contains

The Cochrane Library contains…

  • Cochrane Database of Systematic Reviews

    • Full text of systematic reviews published by Cochrane

    • Each review is updated at least every two years

  • Database of Abstracts of Reviews of Effects (DARE)

    • Critically appraised summaries of other systematic reviews

  • Cochrane Central Register of Controlled Trials

    • Bibliographic references to randomised controlled trials

    • Not critically appraised

  • NHS Economic Evaluation Database

    • Critically appraised summaries of economic evaluations


Cochrane what is it good for

What research has been carried out on self-esteem among doctors working in psychiatric community hospitals?

Is health education effective in improving compliance with HRT?

How useful is Prostate Specific Antigen for detecting cancer of the prostate?

Are there any studies on incidence and prevalence of irritable bowel syndrome?

Cochrane – What is it good for?


Cochrane library http www thecochranelibrary com

Cochrane Libraryhttp://www.thecochranelibrary.com


Pre appraised resources clinical evidence http www clinicalevidence com

Pre-appraised resourcesClinical Evidence - http://www.clinicalevidence.com

  • Gathers good quality evidence on healthcare interventions

  • Presents a digested summary of the evidence

  • Online edition updated and expanded monthly

  • Browse the sections or the A-Z topic list to find the disease or condition before using the search feature


Pre appraised resources evidence based medicine http ebm bmjjournals com

Pre-appraised resourcesEvidence-Based Medicine - http://ebm.bmjjournals.com/

  • Produced by the Centre for Evidence-Based Medicine

  • Searches over 100 journals

  • Finds the 5% of trials that are methodologically sound and presents only those that are clinically important


Internet resources for evidence based practice

Pre-appraised resources

Bandolier - www.jr2.ox.ac.uk/bandolier/index.html

  • Identifies a handful of studies that answer a question, and reports on their quality

  • More of a primary care focus – unusual questions posed by clinicians

  • Light-hearted tone - easy to read and digest


Searching across multiple resources

Searching across multiple resources

  • National Library for Health:www.library.nhs.uk

  • Google:www.google.co.uk

  • Google Scholar:http://scholar.google.com


National library for health http www library nhs uk

National Library for Healthhttp://www.library.nhs.uk


Google

Google

  • Google should be one of the last places you look because the ratio of useful to non-useful resources is so tiny

  • To make a Google search more effective add site:nhs.uk to your search, e.g.

  • Google Scholar restricts to academic resources but it is better to use medical databases

epilepsy lorazepam site:nhs.uk


Primary research databases

Primary research databases

  • Dialog: http://nhs.dialog.com

    • Requires an ATHENS password

    • Direct access to full text articles where available

  • NOTE: Dialog gives access to Medline, CINAHL, Embase, PsycInfo and more…


Remember

Remember…

  • Evidence-based medicine is not about finding a study that looks like it might be useful…

  • … it is about making sure you haven’t missed another study that might be better.

  • If you do go to the primary literature you should initially choose articles based on study design


Hierarchy of evidence for studies of therapy

Hierarchy of evidence(for studies of therapy)

STRONG

WEAK


Critical appraisal

Critical appraisal

  • Not just title, author and journal dependant!

  • A tiny percentage of studies are methodologically sound and clinically relevant

  • Need the skills to evaluate what you read

  • Different criteria for all types of research

    • www.phru.nhs.uk/casp/casp.htm

    • www.agreecollaboration.org (for guidelines)

  • Training available from the Library Services


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