Han et al proposed a simple grading scale for mask ventilation.
(1) adequacy of mask ventilation
(2) need for an oral airway or adjuvant
Criteria for difficult mask ventilation:
(1) inadequate ventilation
(3) need for 2 providers
Oral Airway or Adjuvant
• The use or nonuse of muscle relaxants does not impact the degree of difficulty in mask ventilation (Langeron, 2000)
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