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Table 2 Comparative sizing of single-lumen, Univent and double-lumen tubes [12]

From: Clinical review: Independent lung ventilation in critical care

Single-lumen endotracheal tubes (internal diameter in mm)

Univent tubes (internal diameter in mm)

Double-lumen tube (F)

12.5

9.0

41

12.0

8.5

39

11.0

8.0

37

9.5

7.5

35

9.0

7.0

33

8.0

6.0

28