[Effects of sleeping body posture on sleeping structure and respiratory events in patients with OSAHS].

OBJECTIVE:To observe the effects of sleeping body posture on sleeping structure and respiratory events in patients with OSAHS. METHOD:We assessed the sleeping body position, the sleeping structure, position specific AHI and the Epworth Sleepiness Scale (ESS) in a total of 80 patients with Positional OSAHS. The patients were grouped according to AHI: mild OSAHS (5 < or = AHI <15), moderate (15 < or = AHI < 30) and severe (AHI > or = 30). The polysomnography data and clinical characteristics were compared between each group. RESULT:The severe OSAHS group, when compared with the mild and the moderate ones, had a significant different in REM%, NREM%, NREM LSaO2, RDI, S-AHI and L-AHI due to posture (P < 0.05). The severe and the mild OSAHS groups had significant different in MSaO2, LSaO2 due to posture (P < 0.05). The moderate and the mild OSAHS group had significant different in LSaO2, REM LSaO2 and RDI (P < 0.05). In all mild, moderate and severe groups, the LT% were higher than ST%, but the difference was not significant (P > 0.05). For mild-to-moderate groups, there was no correlation between the ESS and the AHI for any position different (P > 0.05). For severe group, the ESS was significantly correlated with L-AHI (r = 0.551; P < 0.01); the REM L-AHI and NREM L-AHI was also significantly correlated with ESS of severe group (r were 0.516 and 0.528, P < 0.01). CONCLUSION:The L-AHI, NREM L-AHI, REM L-AHI and NREM LSaO2 were considered to monitor the stability of OS-AHS, while REM LSaO2 were consider to clarify the severity of OSAHS.