OBJECTIVETo investigate the related factors of renal functions in hypertensive patients with obstructive sleep apnea-hypopnea syndrome (OSAHS).

METHODSA total of 438 hypertensive patients with complain of snoring at night were enrolled in the study from the First teaching Hospital of Xinjiang Medical University during March 2011 and March 2014. The diagnosis of OSAHS was confirmed with polysomnography examination, and the patients were divided into 4 groups according to the apnea hypoventilation index (AHI): hypertensive group (AHI<10/h, n=102), mild OSAHS group (AHI 10-<15/h, n=97), moderate OSAHS group (AHI 15-<30/h, n=149), and severe OSAHS group (AHI≥30/h, n=90). The blood urea, creatinine, eGFR, 24h-urinary total protein (24h UTP), 24h-urinary microalbumin, cystatin C (Cyst C) were measured and compared among groups, and the influencing factors of renal function were analyzed.

RESULTSThere were no significant differences in age, gender, body mass index(BMI), 24-hour systolic blood pressure (24hSBP), fasting blood-glucose, high-density lipoprotein cholesterol (HDL-C) among the groups (P<0.05). 24h-UTP and 24h-urinary microalbumin in the severe OSAHS group were higher than those in other groups (P<0.05); and all patients with OSAHS had higher Cyst C levels than those without OSAHS (all P<0.05). Logistic regression analysis showed that BMI (OR=1.486, 95% CI 1.022-2.160) and severe OSAHS (OR=7.138, 95% CI 1.835-27.769) were influencing factors of 24h-UTP; blood pressure (OR=2.368, 95% CI 1.324-4.234) and BMI (OR=1.678, 95% CI 1.263-2.230) were influencing factors of 24h-urinary microalbumin; age (OR=1.998, 95% CI 1.325-3.013), blood pressure (OR=3.202, 95% CI 1.319-7.773) and severe OSAHS (OR=5.462, 95% CI 1.103-27.041) were influencing factors of Cyst C.

CONCLUSIONOSAHS is a risk factor for early renal damage in patients with hypertension. Age, BMI, blood pressure and severe OSAHS may be influencing factors for renal function in hypertensive patients with OSAHS.