Which factors suggest a difficult airway?

• A. Mallampati I, normal thyromental distance, full neck mobility.
• B. High Mallampati class (III-IV), reduced thyromental distance, limited neck mobility, small mouth opening, and obesity.
• C. Age under 10, no dental problems.
• D. Previous successful intubation.

Answer: (B)

In airway assessment for emergency intubation, difficulties are most likely when several anatomic and functional predictors line up. A high Mallampati class (III–IV) means less visibility of the oropharyngeal structures during laryngoscopy, making it harder to lift the blade and obtain a good view of the glottis. A reduced thyromental distance indicates a shorter space in front of the neck where the tongue and soft tissues can crowd the airway, which often translates to a more difficult alignment of the oral, pharyngeal, and laryngeal axes during intubation. Limited neck mobility impairs the ability to position the head and neck to optimize that alignment, and a small mouth opening further restricts instrument passage and blade manipulation. Obesity adds soft tissue bulk and potential difficult mask seal and airway visualization, amplifying all the other issues.

Together, these factors create a higher likelihood of a difficult airway, which is why this combination is the best answer. By contrast, a patient with a favorable Mallampati score, adequate thyromental distance, full neck mobility, and a normal mouth opening is unlikely to present significant intubation difficulty. A young patient with no dental problems might still pose some pediatric airway considerations, but the absence of multiple risk factors makes difficulty unlikely. A history of a previous successful intubation also suggests that the airway was manageable before, reducing concern for new difficulty.