Therapeutic selection of auto-continuous positive airway pressure and Bi-level positive airway pressure on the obstructive sleep apnea-hypopnea syndrome

Objective To explore the application of auto-positive airway pressure ( Auto-CPAP ) and bi-level positive airway pressure ( Bi-PAP) on the patients with severe obstructive sleep apnea-hypopnea syndrome ( OS-AHS). Methods 120 OSAHS patients were divided into two groups,namely 60 with AHI≤60 and M SaO2≥80% in A group and 60 with AHI 60 and M SaO2 80% in B group. All patients received Auto-CPAP one day and Bi-PAP therapy the next day. The changes of PSG parameters were observed. Results The therapy effects of Auto-CPAP and Bi-PAP in A group has no significance. The therapy effects of Bi-PAP were much better than Auto-CPAP in B group. The effects of treatment were manifested as sleep efficiency ( SE) ,number of WASO ( wake after sleep onset) ,time of NREM I + II over total sleep time,time of III + IV and REM over total sleep time. The apnea-hypopnea index ( AHI) ,night time mean SaO2( M SaO2) and nighttime the lowest SaO2 ( L SaO2) have no significance. Con-clusion For severe OSAHS patients,when AHI≤60 and M SaO2≥80% ,Auto-CPAP should be used,and when AHI 60 and M SaO2 80% ,Bi-PAP should be selected for therapy.