**2.7 The obese patient**

Obesity is associated with metabolic alteration and promote organ failures that should be investigated during the preoperative evaluation. In the preanesthesia evaluation of the obese patients, the evaluation of the airways is among the most important aspects. In addition to the classic Mallampati scale, the evaluation should also include the STOP-BANG questionnaire [13]. Oximetry and/or polysomnography are secondlevel exams in the overall assessment of OSAS. A neck circumference of at least 43 cm and a high Mallampati score are predictors of both difficult intubation and ventilation. The use of perioperative CPAP is strongly recommended to reduce respiratory complications after surgery.
