Table 4.

Predictors of difficult supraglottic device use*45-53

• Reduced mouth opening

• Supra- or extraglottic pathology (e.g., neck radiation, lingual tonsillar hypertrophy)

• Glottic and subglottic pathology

• Fixed cervical spine flexion deformity

• Applied cricoid pressure • Male sex*

• Increased body mass index*

• Poor dentition*

• Rotation of surgical table during case*

*Some of the listed predictors are device-specific: the latter four predictors originate from a single study using the LMA Unique™53