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The 3/3/2 rule: Figure 3: how to perform the 3/3/2 rule (Image modified from UpToDate.com) If the patient has less than the specified measurement of 3, 3, or 2 fingers in these parameters, this is very specific (95%) for having a more difficult intubation (Mahmoodpoor, 2013)–although only about 25% sensitive.
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