UPPP surgery
UPPP significantly relieve airway obstruction at palate level. The individuals who underwent UPPP surgery must meet the following inclusion criteria: (1)Suffered from OSA and without serious psychiatric, cardiopulmonary, or neurological disease; (2)overnight PSG indicating AHI ≥ 5 and BMI<40kg/m2; (3) Thickened and elongated soft palate and without severe nasal congestion; (4) Friedman stage Ⅰ or Ⅱ; (5) Unsuccessful CPAP treatment or reject CPAP treatment. Individuals and (6) No history of surgical therapy for OSA or anti-reflux treatment before or after surgery. Surgeon (LSS) performed UPPP surgery all the time. The successful UPPP was defined as post-operative AHI is reduced by at least 50% and <20/h.10