Dexmedetomidine and Propofol in Children With History of Obstructive Sleep Apnea

Inclusion Criteria: 1. Patients with documented history of OSA by polysomnography who require anesthesia for MRI sleep study or MRI brain imaging study. 2. Subjects must be 12 months to 25 years of age (inclusive) 3. Either the subject (if subject's age is 18-25) or the subject's legally authorized representative has given written informed consent to participate in the study Exclusion Criteria: 1. The subject has life-threatening medical conditions (American Society of Anesthesiologists Physical Status 4, 5 or 6). The American Society of Anesthesiologists (ASA) classification scale is a measure of physical status or how healthy the patient is. For our study, we will focus on children which are defined as ASA I, II or III which means a healthy child (ASA I), a child with a systemic disease that is mild and well controlled (ASA II) or a child with systemic disease that is severe and controlled (ASA III). 2. The subject is allergic to or has a contraindication to propofol or dexmedetomidine. 3. The subject has a tracheostomy or other mechanical airway device 4. The subject is not scheduled to receive anesthesia-sedation care for the MRI 5. The subject has a history or a family (parent or sibling) history of malignant hyperthermia.