Introduction to Evidence Based Medicine
BUSM III: Family Medicine Clerkship
Boston University Medical Center
Tutorial Index
Tutorial Home
Key for Using this Tutorial
Why Bother With EBM?
(4 pages)
Where Do Questions Arise?
4 Elements of a Clear Clinical Question
Why Be So Specific About the Question? (2 pages)
Step 1: Define the Patient or Problem
Step 2: Define the Intervension
Step 3: Define the Comparison
Step 4: Define the Outcome
Summary Table

WHY BE SO SPECIFIC ABOUT THE QUESTION?

The next few slides present a real example from a recent patient...

Mrs. Johnson

  • Mrs. Johnson is 78 years old, admitted with new onset atrial fibrillation.
  • Patients with afib often are treated with warfarin to prevent embolic stroke.
  • But Mrs. J. is elderly and unstable on her feet.
  • You are worried about her falling while anticoagulated, causing a CNS bleed.

*deep venous thrombosis

You formulate the following question to be answered by a literature search: “Should patients at risk of falls be anticoagulated?”

This question would be hard to answer- it is too general, and does not:

  • describe the patient population
  • state the underlying disease
  • specify type or extent of anticoagulation
  • state the outcome of interest

Let’s try to reformulate the question so that it is more amenable to answering from the literature……


Created by John Wiecha, Department of Family Medicine, Boston University School of Medicine.
Website designed by Stefanie Curry, Department of Family Medicine, Boston University School of Medicine.
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