Accuracy of the Sensory Test Using the Laryngopharyngeal Endoscopic Esthesiometer in Obstructive Sleep Apnea

Inclusion Criteria: * Patients being 18 years old or more referred to the sleep laboratory of a tertiary care university hospital for a baseline polysomnography for suspected OSA. Exclusion Criteria: * Anticoagulation (though not a contraindication for the endoscopic laryngopharyngeal sensory test, anticoagulation is an exclusion criteria for this validation study in order to keep it a minimal-risk study). * Bleeding diathesis. * Basal awake oxygen saturation by pulse oximetry below 88%. * Not agree to participate in the study. * Glasgow coma scale below of 15 (to avoid confusion with involvement of laryngopharyngeal reflexes due to neurological disease accompanied by decreased level of consciousness). * Baseline polysomnography that does not meet validity criteria to be interpreted (according to the American Academy of Sleep Medicine). * Baseline polysomnography performed more than 15 days before the sensory testing. Ordinarily, the sensory testing will be performed the same day or the next day of baseline polysomnography. * More than 5% of total apnoea events being of central origin. * History of maxillofacial or pharyngeal surgery (to avoid confusion with involvement of laryngopharyngeal reflexes due to surgery in this region). * Laryngopharyngeal tract malignancies (to avoid confusion with involvement of laryngopharyngeal reflexes due to tumours). * Central Nervous System (CNS) surgery in the last three months or that has left neurological sequelae (to avoid confusion …