The DRS stands for Drag Reduction System, which enables a car to open its rear wing to limit the downforces on the car. This increases the car's theoretical performance and in theory facilitates passing.
The surgical treatments for obstructive sleep apnea include nasal surgery, palate surgery (including uvulopalatopharyngoplasty [UPPP]), upper airway stimulation therapy, tongue reduction surgery, genioglossus advancement, maxillo-mandibular advancement, tracheostomy, and bariatric surgery.
Medical Definition of central sleep apnea. : sleep apnea that is caused by a disturbance in the brain's respiratory center Less common is central apnea (not usually linked to snoring), in which the brain fails to send the appropriate signals to the breathing muscles.âAndrew Weil, Self Healing, March 2002âcompare obstructive sleep apnea.