Correlation analysis of polysomnography indexes in patients with obstructive sleep apnea-hypopnea syndrome

Objective To study the polysomnography(PSG) indexes which can reflex the severity of anoxia in obstructive sleep apnea-hypopnea syndrome(OSAHS) more comprehensively. Methods Sixtythree OSAHS patients' PSG indexes, including the apnea-hypopnea index (AHI), apnea time/total sleeping time (AM), hypoventilation time/total sleeping time (HM), mean oxygen saturation (MSaO2),the lowest oxygen saturation (LSaO2) and the longest apnea time (LAT) were analyzed retrospectively. Results In patients with OSAHS,the AHI was positively correlated with AM, HM and LAT(P ＜ 0.01 or ＜ 0.05 ), and was negatively correlated with MSaO2 and LSaO2(P ＜ 0.01 ). The AHI had linear regression relationship with AM,HM and LSaO2 (F =202.264,P ＜0.01). Conclusions Among the PSG indexes,AM is intimately associated with AHI. Therefore,compared with LSaO2,AM and HM can reflex the severity of anoxia in patients with OSAHS more accurately. Key words: Sleep apnea,obstructive;  Polysomnography