[Airway assessment scales, subjectivity and updates].

In airway evaluation, scales that depend on external factors (experience) are used, as well as the patient's clinical factors. Research studies should show as far as possible the clinical characteristics of patients (age, sex, weight, height). Nowadays, the population receiving medical attention from us is overweight or obese and their anesthetic management presents several challenges. The predictive index for difficult intubation adds up the scores of several scales whose assessment depends on the examiner. Mortality due to intubation failures should lead us to improve airway techniques and assessments through increasingly accurate instruments.