Effect of Standard Laryngoscopy Versus Video-laryngoscopy

Inclusion Criteria: * patients undergoing elective surgery requiring oral tracheal intubation; * ≥18 years of age; * simplified Arné score ≥11; * Written informed consent will be obtained from every participant. Exclusion Criteria: * ≤18 years of age * interincisor distance at maximal mouth opening ≤2 cm; * planned awake fiberoptic intubation because patients are patients considered to be high-risk for difficult intubation or difficult mask ventilation (e.g. with neck tumours, complete cervical arthrodesis; neck circumference \>50 cm); * patients at risk of gastric aspiration * planned nasal intubation.