1 Introduction to Evidence- Based Medicine: question formulation Dr Kamal R. Mahtani BSc PhD MBBS PGDip MRCGP GP and Clinical Lecturer Centre for Evidence Based Medicine University of Oxford October 2014
3 Outline of the EBM Thread Today 9 to 9.45am Why we need EBM Question formulation Assignment 10 to 11 am Critical appraisal of RCTS 11 to 12 am Systematic Reviews pm Searching the evidence 4pm to 5pm Searching session (optional) (Cairns library/ private study) Tues pm Presentations (see back of workbook)
4 Assignment Assigned to work in pairs 7 minute presentation 3 minutes for questions
5 Assignment (criteria) Turning up Clinical Question using PICO Search strategy Appraisal Interpretation of findings Clear recommendation Overall Impression
6 The Question Mr. X is a 58 year old obese gentleman suffering from non-insulin-dependent diabetes mellitus. We want to know whether the drug metformin could be used to improve his condition, as measured by lowering his glycosylated haemoglobin. P I C O Obese adults suffering from NIDDM Metformin Placebo Change in glycosylated haemoglobin
7 The Search We Searched PubMed for the following terms Non-insulin-dependent diabetes mellitus (MeSH) Metformin Glycosylated haemoglobin Placebo Obese Out of the 8 trials that appeared through the search, we selected the DeFronzo 1995 trial as it s abstract suggested it was the most relevant to our question.
8 The Study appraisal Study title Efficacy of metformin in patients with non-insulin-dependent diabetes mellitus. Critical appraisal Randomisation: the paper did not disclose the method of randomisation, therefore we cannot eliminate the possibility of the introduction of bias through inappropriate methods of randomisation. However, the baseline demographics appeared satisfactory. Ascertainment: there was a follow up of 78% in the metformin group and 72% in the placebo group, which could be better. Measurements: our chosen outcome of glycosylated haemoglobin is an objective measurement, and not operator dependent, therefore is less open to bias from the technicians involved. Blinding: full double blinding was carried out throughout the trial, again reducing possibilities for the introduction of biases.
9 The Results (interpretation of findings) The measurements for mean glycosylated haemoglobin (±SE) in the two groups were as follows. In the metformin group: 7.1% (±0.1%) In the placebo group 8.6% (±0.2%) There was a mean absolute reduction in glycosylated haemoglobin of 1.5% in the metformin group, bringing the patients closer to the ideal of under 7%. However, there were more side effects in the metformin group (14) than the placebo group (2). The side effects were digestive symptoms, primarily diarrhoea.
10 The Implications Based on these results, we would feel happy to recommend that Mr. X be treated with metformin for his non-insulindependent diabetes mellitus. We would also warn him of the risk of adverse digestive side effects. Given time, we would like to look at more papers to see how metformin compares to other drugs for treatment of NIDDM, such as glicazide and insulin.
11 Patient concern Improved patient outcomes Best research evidence Clinical expertise
12 EBM can (amongst other things!) Help you make clinical decisions Share decision making with patients Provide better diagnostic reasoning Understanding benefits versus harms Allow you to practice more safely
13 Practicing EBM the 4 A s Step 4 Step 3 Step 2 Step 1 Ask a clinical question Acquire the best evidence Appraise the evidence Apply the evidence
14 The EBM cart in the old days
17 Practicing EBM the 4 A s Step 4 Step 3 Step 2 Step 1 Ask a clinical question Acquire the best evidence Appraise the evidence Apply the evidence
18 Types of questions Specific clinical decisions Primary/pre assessed studies Patient centred Diagnosis, prognosis, management of disease More general Whole condition, symptoms, signs Pathophysiology Textbooks/online
19 Question formulation using PICO WB p4 Element Tips Example Starting with your patient ask How would I describe a group of patients similar to mine? Balance precision with brevity. Patient or Problem Intervention Comparison (Intervention) Outcomes Ask Which main intervention am I considering? Be Specific Ask What is the main alternative to compare with the intervention? Be specific Ask What can I hope to accomplish? or What could this exposure really affect? Be specific In patients with heart failure from dilated cardiomyopathy who are in sinus rhythm would adding anticoagulat-ion with warfarin to standard heart failure therapy, when compared with standard therapy alone, lead to lower mortality or morbidity from thromboembolism."
20 Types of question 1. How common is the problem Prevalence 2. Is early detection worthwhile Screening 3. Is the diagnostic test accurate Diagnosis 4. What will happen if we do nothing Prognosis 5. Does this intervention help Treatment 6. What are the harms of an intervention Harms
21 Clinical scenario Mrs Whish, is a 28 y solicitor. She comes to see you today as she is frustrated by the symptoms of his irritable bowel syndrome. She feels that they have got worse and despite trying numerous things that you have suggested nothing has helped. She read an article in The Daily Mail suggesting that probiotic drinks help and wonders what you think?
22 Framing questions: using PICO Patient/ Population Broad Adults with IBS Specific Gender? Age? How long have they had IBS? Intervention Probiotics Type? Tablet? Drink? Comparison No probiotics Placebo? Standard therapy? Outcome Improve symptoms Which ones? All?
23 Scenario 2 CHILDHOOD SEIZURES Childhood seizures are common and frightening for the parents, and the decision to initiate treatment is a difficult one. What is the risk of further recurrences following a single seizure of unknown cause? WB p7
24 Scenario 3 VACCINATION AND NEEDLE LENGTH You are the practice nurse and one of your colleagues tells you it is better to use a short needle than a long needle when immunising babies for their first ever vaccinations, as it reduces the swelling and decreases the parents anxiety about further vaccinations. You wonder if your colleague is correct? WB p8
25 Scenario 4 p9 CHILDREN AND ANTIVIRALS You are the GP and the next patient brings their 3 year old child who is unwell with a fever, the mother wants to know whether she should give the child tamiflu? WB p9
26 Angela is a patient on the general medical ward who recently moved to the area to be closer to her son and his family. She is 72 years old and has a history of congestive heart failure. She was admitted 2 days ago having presenting with non specific chest pain, shortness of breath, an enlarged liver, swollen ankles and has been diagnosed with a Non ST elevation MI. She has been hospitalized twice within the last 6 months for worsening of heart failure. What are your questions? At the present time she says she is pain free and is extremely diligent about taking her medications (lisinopril and aspirin), and wants desperately to stay out of the hospital. She reports being mobile and lives alone with several cats. She also tells you she is a bit hard of hearing, has a slight cough, is a smoker of 20 cigs a day for 40 years. When you examine her: BP is 170/90, her ankles are slightly swollen, her pulse is 80 and irregular, her Hb is 10.5g/dL and her Na is 132. ir WB p5 She is about to be discharged home on her previous medications plus 25mg spironolactone od. She is happy to be going home and asks you if this new medication will help her stay out of hospital?i
27 Patient or Problem Intervention Comparison intervention Outcomes Tips for Buildi ng Describe a group of patients similar to your own What intervention are you considering What is the main alternative to the intervention What do you hope to accomplish with the intervention Exam ple In elderly patients with congestive heart failure does treatment with spirinolactone when compared with standard therapy alone lead to a decrease in hospitalization
28 Practicing EBM the 4 A s Step 4 Step 3 Step 2 Step 1 Ask a clinical question Acquire the best evidence Appraise the evidence Apply the evidence
29 Types of evidence
30 Levels of evidence
31 Patient or Problem Intervention Comparison intervention Outcomes Tips for Buildi ng Describe a group of patients similar to your own What intervention are you considering What is the main alternative to the intervention What do you hope to accomplish with the intervention Exam ple In elderly patients with congestive heart failure does treatment with spirinolactone when compared with standard therapy alone lead to a decrease in hospitalization
33 Apply the evidence We can tell Angela that her new drug could reduce her risk of being rehospitalised by 35% as well as improving some the symptoms of her heart failure
34 Analysis of abstracts 1. What is the question (PICO) of the study? 2. What is the purpose of the study? 3. Which study type would give the highest quality evidence to answer the question? 4. Which is the best study type that is also feasible? 5. What is the study type used? 6. What do the results mean? WB p16
35 Analysis of abstracts 1. What is the question (PICO) of the study? 2. What is the purpose of the study? 3. Which study type would give the highest quality evidence to answer the question? 4. Which is the best study type that is also feasible? 5. What is the study type used? 6. What do the results mean? WB p17
36 PICO exercise Think of clinical question/scenario you have come across. Frame it in a PICO format What type of question is it? Aetiology/cause? Prognosis? Diagnosis? Treatment/intervention How will you answer the question?
37 Practicing EBM the 4 A s Step 4 Step 3 Step 2 Step 1 Ask a clinical question Acquire the best evidence Appraise the evidence Apply the evidence
38 Outline of the EBM Thread Today 9 to 9.45am Why we need EBM Question formulation Assignment 10 to 11 am Critical appraisal of RCTS 11 to 12 am Systematic Reviews pm Searching the evidence 4pm to 5pm Searching session (optional) (Cairns library/ private study) Tues pm Presentations (see back of workbook)
39 Risk of bias assessment of internal validity Critical appraisal Do I believe it?
40 Practicing EBM the 4 A s Step 4 Step 3 Step 2 Step 1 Ask a clinical question Acquire the best evidence Appraise the evidence Apply the evidence
41 External validity Will it change the way I manage this patient?
42 Assignment Assigned to work in pairs 7 minute presentation 3 minutes for questions
43 Assignment (criteria) Turning up Clinical Question using PICO Search strategy Appraisal Interpretation of findings Clear recommendation Overall Impression
44 Does cinnamon reduce fasting blood glucose in Type II diabetics? Emma Thurston and Suzanne Harrogate
45 The Question Miss S. has poorly managed Type II diabetes and asks if taking cinnamon would improve her fasting blood glucose levels. P I C O 57 year old lady with poorly managed Type II diabetes Eating cinnamon in addition to prescribed medication Diabetic medication without cinnamon Fasting blood glucose levels
46 The Search We searched the MEDLINE database: Cinnamon AND diabetes Cinnamon AND Type II diabetes AND fasting blood glucose We selected: Leach MJ, Kumar S. Cinnamon for diabetes mellitus. Cochrane Database of Systematic Reviews 2012, Issue 9 This article systematically reviewed papers investigating whether cinnamon affected diabetic management, using fasting blood glucose as its primary outcome. The paper s recent publication suggests that the latest evidence collected will have been included in their review. The mean age range of participants in trials reviewed included that of Miss S.
47 The Study appraisal Leach MJ, Kumar S. Cinnamon for diabetes mellitus. Cochrane Database of Systematic Reviews 2012, Issue 9 The authors search: 14 search engines were used to find relevant papers, including: The Cochrane Library (issue 12, 2011). MEDLINE (until January 2012). EMBASE (until January 2012). Selection: 2 reporters independently scanned the abstract of every paper retrieved by the search to ensure inclusion criteria were met: Randomised controlled trials Orally administered monopreparations of cinnamon Placebo/ active medication/ no treatment. Type I or II diabetes Potential limitation only papers published in English were selected. Pertinent reports published in other languages may have been missed.
48 RANDOMISATION 10 prospective, parallel-group design, randomised control trials, involving a total of 577 participants with either Type 1 or 2 diabetes were included. 1 of the 10 studies didn t use a placebo control. 6 studies were double-blinded, 2 single-blinded and 2 undefined with respect to blinding. However, the precise blinding protocol was not clearly described in many trials included in the review. ALLOCATION Gender was approximately distributed evenly in most trials. The mean age of participants ranged from years. Bias was assessed independently by two reviewers using a pre-defined criteria (Higgins, 2008). Risk of bias was high or unclear in 8/10 trials, with the remaining 2 assessed as having a moderate risk. Leach MJ, Kumar S., 2012.
49 MAINTENANCE All studies used oral monopreparation of cinnamon in tablet or capsule form. 3 studies were excluded after careful evaluation of the full publication primarily due to failure to meet the diagnostic criteria for Type 1 or 2 diabetes. Where possible, any relevant missing information on the trial was sought from the original author(s) of the article e.g. reasons for drop-outs were inconsistently reported. MEASUREMENT Heterogeneity was assessed by visual inspection of the forest plots and by using a standard Chi 2 test: Cinnamon vs. Placebo; Outcome fasting blood glucose level (mmol/l) Chi 2 =0.97. If one of the primary outcome parameters showed significant differences between the intervention groups subgroup analysis was performed: Cinnamon species Cinnamon dosage Treatment duration Type of diabetes (I or II)
50 The Results (interpretation of findings) There were 8 studies reporting data on fasting blood glucose for 388 participants. These showed significant heterogeneity (Chi 2 =0.82). Visual inspection of the funnel plot and subgroup analysis led the authors to exclude 2 out of these 8 studies as outliers. Analysis of the 6 remaining studies found no statistically significant difference in fasting blood glucose between cinnamon and placebo groups (P=0.55 ; 95%CI to 0.18). Adverse effects were recorded in 4 trials. 3 events in intervention groups: Rash Hives Hypoglycaemic episode 4 events in control groups. Nausea Stomach ache Other frequent illness Overall, there was no significant difference between adverse effects in the intervention and control group.
51 The Implications Based upon this systematic review there is no statistically significant evidence to support a doctor advising a patient like Miss S to take cinnamon in an attempt to lower their fasting blood glucose levels. Miss S. should be warned that if she does take cinnamon there is a small possibility of her experiencing some mild side effects. It would also be worthwhile to suggest she checks she is not allergic to cinnamon before embarking on a treatment programme.
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