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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