We have compared the laryngeal tube (LT) and ProSeal laryngeal mask (PLMA) in 80 Jemale patients Jor the success rate oj insertion, gas leak pressure ,pulmonary ventilation and the incidence ojgastric insufflation. In a randomized clinical study, the laryngeal tube and ProSeallaryngeal mask were inserted after induction oj anaesthesia and neuromuscular block. The cuffs were inflated until. the intraculf pressure reached 60 ! cm H20. We measured adequacy oJ ventilation and the minimum airway '[ pressure at which gas leaked around the cuff. The presence or absence oj gastric insuiflation, was studied at an inflation pressure oj 20 cm H20. Statistical analysis was with paired t test (parametric data), and Kruskal-WaUis test, Mann-Whitney rank sum test, and chi-square test (nonparametric data). P< 0.05 was considered significant. J In all cases, both airway devices were inserted successfully.lt was possible to ventilate through the laryngeal tube and the ProSeal laryngeal mask in all patients. Peak airway pressure (P