Mastering airway management is one part procedure and three parts decision making. Properly assessing the context, alternatives and considering the worse case downside to any action taken with airway management is all about cognition (decision-making). Here is some evidence to help inform your decision making regarding advance airway management in the pre-hospital environment. Delving into this paper and studying the data is a worthy exercise, but in the meantime here is a version that quickly communicates the highlights. Enjoy.
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