A Comparison of Tracheal Intubation Using the Totaltrack vs the Macintosh Laryngoscope in Difficult Airway

Inclusion Criteria: * Patients undergoing elective general anesthesia requiring OTI. * Patients duly informed and they have signed the informed consent during the pre-anesthetic consultation, or be sought after due meditation, expressing its consent to the inclusion in the study. * Age ≥18 years. * ASA I-III. * Sufficient intellectual capacity to understand the procedure and equipment used. * Predictors of difficult airway (Mallampatti class III or IV; thyromental distance \<6 cm, sternomental distance \<12.5 cm, interincisal distance\<4.0 cm, bite test II or III, cervical mobility \<90 ° or history of difficult intubation). * Thyroid surgery or present pharyngolaryngeal, glottic or cervical pathology * BMI \>30kg / m2 * Not presenting risk factors for aspiration * Not presenting respiratory disease, coronary or cerebral vascular. * Do not have a preoperative sore throat Exclusion Criteria: * Failure to meet the above criteria * Pregnancy * Allergy to any drug included in the protocol.