Use of The Laryngeal Mask Airway Unique for Adenotonsillectomy

The patients will be randomised by sealed envelopes. After premedication with oral midazolam the children will be monitored with EKG, peripheral oxygen saturation, non invasive blood pressure. The anesthetic induction will be inhalatory with sevoflurane plus O2/N2O (50%) in a Jackson Rees device and hydratation with Ringer's solution. After propofol 1.5mg.kg and fentanyl 2.0mcg.kg, according the randomization we will to use the disposable Unique LMA, choosing the size and insertion techinique according the manufactor's indication or a laryngoscopie with Miller's blade and a paedicatric cuffed tracheal tube, proper to child size . The surgeon will to use the Mc Ivory device to open the mouth and at the end of the surgical procedure, we will perform a tracheoscopy with a apropriated size flexibe fiberscope, to look for blood or secretions. We will analyse the oxygen level at the follow times: 1-after remove the facial mask, 2-after the insertion of the respiratory device (LMA or tracheal tube), 3-after the patient positioning (neck hyperextension), 4- after remove the respiratory device, 5-at admitssion in the recovery room. We will register the occurence of: respiratory adverse events like hypoxia (definied as oxygen saturation bellow 92%), laryngospasm, bronchospasm, cough, and stridor. After 24 hours, by a phone call, we will ask about nausea, vomits and sore throat. The duration of this study will be about 6 hours at the hospital.