There are two main types of questions that may arise from a patient dilemma:
Answering foreground questions involves developing well-formed, focused clinical questions. The PICO framework is commonly used to translate and structure patient dilemmas into focused questions. Using PICO helps to identify the important concepts for your search strategy and makes searching for evidence easier and more time-effective.
|Patient, population or problem||What are the characteristics of the patient or population (e.g. disease or condition, age, gender)?|
|Intervention or exposure||What is the main intervention of interest (e.g. drug or other treatment, diagnostic/screening test)?|
|Comparison||What is the alternative being considered (e.g. standard therapy, placebo, no treatment)?|
|Outcomes||What are the relevant outcomes (e.g. reduced risk of mortality, return to function, accurate diagnosis)?|
A patient dilemma...
Jack is a 40 year-old bricklayer who has been experiencing intermittent low back pain over the last few weeks. He has been taking Panadol to alleviate the pain but his friend who also experiences back pain suggested trying Ibuprofen instead. As his general practitioner (GP), Jack has asked you whether Ibuprofen is better than Panadol for back pain.
Step 1: Identify the PICO elements from the patient dilemma
P - Adult with low back pain
I - Ibuprofen
C - Panadol
O - Reduced back pain
Step 2: Use the PICO elements to formulate the clinical question
In adults with low back pain (P), is Ibuprofen (I) compared to Panadol (C) more effective in reducing back pain (O)
What type of study best fits your focused clinical question? The evidence pyramid is used to illustrate the evolution of the literature. It ranks study types based on the strength and precision of their research methodology. As you move up the pyramid the amount of available literature decreases, but increases in its relevance to the clinical setting.
Meta-analyses and systematic reviews sit at the top of the pyramid. The base of the pyramid is where information usually starts with an idea or laboratory research.
Secondary (filtered) research
Primary (unfiltered) research
Case Series consist of a group or series of case reports involving patients with an outcome of interest. As they are reports of cases and use no control groups, they have no statistical validity.
Animal and Laboratory Research / Background information includes animal research, laboratory studies and testing.
PICO can be extended to PICOS where S stands for Study design.
The following table outlines suitable study designs to answer a clinical question. Meta-analyses and systematic reviews where available, will often provide the best answers to clinical questions.
|Question type||Definition||Best study design|
|Therapy||The effect of an intervention(s) on a patient||Randomized Controlled Trial (RCT)|
|Diagnosis||Ability of a test to differentiate between those with or without a condition||Prospective, blind comparison to a gold standard|
|Harm / etiology||The effect of potentially harmful agents||Cohort study or Case control study|
|Prognosis||The likely progression, outcome or survival time for a condition||Cohort study|
|Prevention||Reducing chance of a disease by changing risk factors or early diagnosis & treatment||RCT|
For the example clinical question ("In adults with low back pain, is Ibuprofen compared to Panadol more effective in reducing back pain?") we are looking at the effect of a drug on a patient. This is a therapy question; the best study design would be an RCT.
Qualitative questions look at people's experiences, attitudes, beliefs, opinions, perceptions, etc. A modified framework, PICo, can be used for these types of questions. PICo stands for Population, Interest and Context.