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HAN scale for mask ventilation

HAN scale for mask ventilation 

Grade 1: Ventilated by mask
Grade 2 :Ventilated by mask with oral airway/adjuvant with or without muscle
relaxant
Grade 3 :Difficult ventilation (inadequate, unstable, or requiring two providers)
with or without muscle relaxant
Grade 4: Unable to mask ventilate with or without muscle relaxant.

Han et al. Anesthesiology 2004 101: 267.

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