Table 1 Grading of the views of the laryngeal field from the distal aperture of the airway tube and the esophagus from the drain tube using fiberoptic bronchoscopy

Laryngeal field

1

Vocal cords not seen and device functions inadequately

2

Vocal cords not seen but device functions adequately

3

Vocal cords and anterior epiglottis

4

Vocal cords and posterior epiglottis

5

Only vocal cords visible

Esophagus

A

Sealed orifice of esophagus

B

Crescent shape opening of esophagus

C

Full opening of esophagus