Abstract:Objective To explore the relationship between severity of obstructive sleep apnea syndrome (OSAS) and glycolipid metabolism, inflammatory factors and renal function in patients with type 2 diabetes mellitus combined with obstructive sleep apnea syndrome. Methods From March 2016 to June 2018, 123 patients with type 2 diabetes mellitus who were admitted to our hospital according to the hourly apnea-hypopnea index (AHI) were divided into simple diabetes mellitus group (n?=?39, AHI < 5?times/h), OSAS mild group (n?=?32, AHI 5 to 15 times/h), OSAS moderate group (n?=?28, AHI 16 to 30 times/h) and OSAS severe group (n?= 24, AHI > 30 times/h). At the same time, 40 healthy volunteers were randomly selected as control group. The apnea-hypopnea index (AHI), low arterial oxygen saturation (LSaO2), mean arterial oxygen saturation (MSaO2), blood glucose indexes such as fasting blood glucose (FBG), 2 hour postprandial blood glucose (2?h PBG), glycosylated hemoglobin (HbA1c), and blood lipid indexes such as total gholesterol (TC), high density lipoprotein (HDL), low density lipoprotein (LDL), triglyceride (TG), and inflammatory factors indexes such as interleukin-6 (IL-6), interleukin-8 (IL-8), tumor necrosis factor-α (TNF-α), high sensitivity C-reactive protein (hs-CRP), intercellular adhesion molecular 1 (ICAM-1), and renal function indexes such as serum blood creatinine (Scr) and eGFR were compared among groups. And the relationships between sleep respiration indexes and glucose and lipid metabolism indexes, and inflammatory factors indexes and renal function indexes were analyzed. Results The BMI, FBG, HbA1c, TC, LDL, TG in patients with type 2 diabetes mellitus were higher than those in control group, and HDL was lower than that in control group (P?< 0.05). The FBG, HbA1c, TC, LDL, TG in OSAS mild, moderate and severe group were higher than those in simple diabetes mellitus group, and HDL was lower than that in simple diabetes mellitus group (P?0.05). The serum IL-6, IL-8, TNF-α, hs-CRP, ICAM-1 levels in patients with type 2 diabetes mellitus were higher than those in control group (P?0.05), and above indicators in OSAS mild, moderate and severe group were higher than those in simple diabetes mellitus group (P?< 0.05). The eGFR level in patients with type 2 diabetes mellitus was lower than that in control group (P?< 0.05). The eGFR level in patients with OSAS mild, moderate and severe group was lower than that in simple diabetes mellitus group (P?0.05). The AHI in diabetic kidney disease (DKD) group was higher than that in non-DKD group, while LSaO2 and MSaO2 were lower than those in non-DKD group (P?0.05). Pearson product moment correlation analysis showed that there is positive correlation between AHI and BMI, FBG, HbA1c, TC, LDL, TG, IL-6, IL-8, TNF-α, hs-CRP, ICAM-1 (P?0.05), and LSaO2 and MSaO2 are negatively correlated with the above indexes (P?0.05). There was negative correlation between AHI and HDL, eGFR (P?< 0.05), and LSaO2 and MSaO2 are positively correlated with HDL and eGFR (P?0.05). Conclusions OSAS can cause abnormal glucose and lipid metabolism, inflammatory reaction and renal impairment in patients with type 2 diabetes mellitus. Moreover, more serious the OSAS is, more obvious the abnormal glucose and lipid metabolism, the inflammatory reaction and the renal function impairment are.