Objective: To investigate the diagnosis and treatment for obstructive sleep apnea syndrome (OSAS) . Methods≥: 82 cases were monitored with polysomnography (PSG). 57 cases were diagnosed as OSAS (AHI5). 25 cases were normal ( AHI<5).The clinical manifestations of OSAS were analysed .The parameters of PSG between the two groups before and after treatment with CPAP were compared. Results: The major clinical manifestations

concomitant disorders

and complications of OSAS patients were as follows : snoring in 57 cases (100%)

daytime lethargy in 31 cases (54.4%)

choking during sleep in 16 cases (28.1%)

narrow oropharynx in 52 cases (91.2%)

obesity in 28 cases (49.1%)

hypertension in 22 cases (38.6%)

diabetes mellitus in 2 cases (3.5%)

and cor ±pulmonale in 3 cases (5.3%). The parameters of PSG showed that the longest apnea duration was 56.2521.36 ±±seconds

the mean apnea duration 25.1310.86 seconds

apnea /hypopnea index (AHI) 45.2220.54seconds

and the lowest SaO2%± () 61.2517.68. 1 case of severe OSAS was treated with CPAP . The parameters of PSG and symptoms were improved obviously after treatment. Conclusion: It is emphasized that early recognition of OSAS is of critical importance . PSG is an effective method of diagnosis and evaluating effects of treatment for OSAS patients .