Comparison of Spontaneous Ventilation Time in Air Without Desaturation After Positive Pressure Extubation Versus Aspiration Extubation When Awakening From General Anesthesia

Inclusion Criteria: * The patient must have given his/her informed and signed consent * The patient must be insured or beneficiary of a health insurance plan * The patient is available for 1 hour of follow up * ASA 1 to 3 * The patient is schedules for orthopedic surgery (limbs) with general anesthesia Exclusion Criteria: * The patient is participating in another study * The patient is in an exclusion period determined by a previous study * The patient is under judicial protection, under tutorship or curatorship * The patient refuses to sign the consent * It is impossible to correctly inform the patient * The patient is pregnant * The patient is breastfeeding * Chronic respiratory insufficiency * Cardiopathy * Obstructive sleep apnea * Two or more predictive criteria for difficult mask ventilation (age \> 55 years, toothless, beard, snorer, BMI \> 26) * No predictive criteria for difficult intubation (SPIDS \<= 10)