passages.id: split_9_validation_1334_passage
passages.type: progene_text
passages.text: Endotracheal cuff pressure during anaesthesia in three groups of patients has been monitored : Group 1 ( n. 41 ) : endotracheal tube with low - pressure cuff using N2O / O2 ( 2:1 or 1 : 1 ) ; Group 2 ( n. 55 ) : Brandt's double cuff - tubes using N2O / O2 ( 2 : 1 or 1:1) ; Group 3 ( n. 20 - control group ) : tubes with low - pressure cuff using O2 / air .