Enliven: Journal of Anesthesiology and Critical Care Medicine | Open Access Journals | Open Access Articles
Cylinder Diameter Age* Suitable tubes Results

8.15 mm

3

ID 4.0 or 4.5

Leaked at all cuff pressures.

8.50 mm

4

ID 4.0 or 4.5

ID 4.0 leaked at all pressures.
ID 4.5 leaked till 30cm H2O
ID 5.0 cannot be inserted due to frill.

9.70 mm

8

ID 5.0 or 5.5

Both prevented leakage.
ID 4.5 leaked.

12.05 mm

12

ID 6.0 or 6.5

ID 6.0 prevented leakage.
ID 6.5 cannot be inserted due to frill.
ID 4.5 leaked, ID 5.0 leaked 15 and 20 cmH2O,
ID 5.5 prevented leakage

14.50 mm

16

ID 7.0 or 7.5

Both prevented leakage.
ID 5.0-8.0 prevented leakage.

20.00 mm

adult

ID 5.0-8.0 prevented leakage.

* Corresponding age by trachea diameter according to Griscom and Wohl’s [7] data

† Suitable tube sizes calculated by Khine et al’s formula[5] and Duracher et al’s formula [6], respectively.