For example, when there is a first degree burn, which reference should I check? And in another scenario, when someone overdosed a certain medication, which reference should I check for first aid?
Evidence-Based Practice requires that clinicians search the literature to find answers to their clinical questions. There are literally millions of published reports, journal articles, correspondence and studies available to clinicians. Choosing the best resource to search is an important decision. Large databases such as PubMed/MEDLINE will give you access to the primary literature. Secondary resources such as ACP Journal Club, Essential Evidence, FPIN Clinical Inquiries, and Clinical Evidence will provide you with an assessment of the original study. The Cochrane Library provides access to systematic reviews which help summarize the results from a number of studies. These are often called “pre-appraised” or EBP resources.
To quickly find an answer, we might first look at an appraised resource, such as ACP Journal Club. ACP Journal Club’s general purpose is to select from the biomedical literature articles that report original studies and systematic reviews that warrant immediate attention by physicians attempting to keep pace with important advances in internal medicine. These articles are summarized in value-added abstracts and commented on by clinical experts. Studies included in this small database are relevant, newsworthy and critically appraised for study methodology.
European Resuscitation Council also publishes their EBP- based guidelines, they have their own section for first aid. I highly recommend their material for anything emergency medicine- related!
You can find them here (click Download Guidelines):
A document that I refer to often is the "IFRC International First Aid Guidelines 2016" (Type that in Google to download the .pdf) I found this to be a very well prepared document. For each of the first aid skills it highlights if the evidance is strong, weak, or just a good practise point. From this you can search further into that respective skill specifically. This is just one of the few documents that can be referanced/looked up by a first aid skill.