Group A (N= 30) - Subgroup A1 (N=15) - Patients will be intubated using Endotrol Tracheal Tube without stylet (Covidien, Colorado, USA). Subgroup A2 (N= 15) - Patients will be intubated using styletted endotracheal tube the Gliderite (Teleflex Medical, Hudson RCI/ Sheridan/ HBT). Group B (N= 30) - Subgroup B1 (N=15) - Patients will be intubated using Endotrol Tracheal Tube without stylet (Covidien, Colorado, USA).