Table 3 Study results for securing the airway (mean (SD))

Placement success

 Success with LMA-S (%)

90%

91%

0.76

 Change of LMA size (%)

20%

24%

0.47

 Failure with LMA-S (%)

10%

9%

0.76

Distance fixation tab to lip

 Initial (cm)

1.5 (0.76)

1.7 (0.67)

0.11

 Final (cm)

1.4 (0.62)

1.5 (0.65)

0.5

Final LMA-S size

0.61

 3

7.6%

12%

 4

80.4%

76%

 5

12%

12%

Position adjustment required

21.7%

16.3%

0.42

Oropharyngeal leak pressure (cmH₂O) (mean (SD))

24.8 (6.5)

25.2 (6.2)

0.63

Pathological clinical tests (%)

 “Lube-tube” test

16.3%

17.6%

0.82

 Sternal notch test

13%

14.3%

0.81

 Gastric tube not placed

3.3%

4.4%

0.69

Fiberscopic evaluation (%)

 Correct position

82%

79%

0.77

 Incorrect: device tip

1%

3.3%

 Incorrect: epiglottis

2%

3.3%

 Incorrect: glottis

15%

14.3%

Glottic narrowing (n (%))

17 (19.3%)

13 (14.1%)

0.35

 Of these - ventilation impaired and intervention required

13 (77%)

5 (39%)

0.04

 Improved by deepening anaesthesia

4 (24%)

0 (0%)

0.06

 LMA reinsertion

7 (41%)

4 (31%)

0.56

 Intubation necessary

2 (12%)

1 (8%)

0.71