BACKGROUNDThe prevalence of sleep disorders has been shown to be high in patients with chronic dialysis patients and may contribute to impaired quality of life and higher mortality in this population. However, there are few data on the relationship of sleep disorders and their risk factors in chronic dialysis patients. The aim of this study was to evaluate the relationship of sleep disorders and their risk factors in chronic dialysis patients.

METHODSA total of 42 continuous ambulatory peritoneal dialysis (CAPD) patients were involved in this cross-sectional study. Sleep quality was assessed by the Pittsburgh Sleep Quality Index (PSQI). Restless legs syndrome (RLS) was diagnosed according to the criteria of the International Restless Legs Syndrome Study Group. And depression was assessed by Hamilton depression scale. General information and laboratory data were collected.

RESULTSThe prevalence of sleep disorders was 47.6% in the CAPD patients. According to the PSQI, the 42 CAPD patients were divided into sleep disturbance group and non-sleep disorders group. There were no significant differences in age, gender, dialysis duration, hemoglobin, serum creatinine, urea nitrogen, β2-microglobulin, parathyroid hormone, calcium, and phosphorus between CAPD patients with sleep disorders and those without sleep disorders. But the level of serum albumin (Alb) in CAPD patients with sleep disorders was significantly lower than that in CAPD patients without sleep disorders (31.3 ± 1.4 vs. 34.3 ± 3.7, t = 3.603, P = 0.001) . And the prevalence of RLS and depression was significantly higher than that in CAPD patients without sleep disorders (RLS: 11/22 vs. 1/20, χ(2) = 10.395, P = 0.001; depression: 7/22 vs. 1/20, χ(2) = 4.886, P = 0.027). In CAPD patients with RLS, the prevalence of sleep disorders was significantly higher than that in CAPD patients without RLS (11/22 vs. 11/30, χ(2) = 10.395, P = 0.001). And in CAPD patients with depression, the prevalence of sleep disorders was significantly higher than that in CAPD patients without depression (7/8 vs. 15/34, χ(2) = 4.886, P = 0.027). In CAPD patients, bivariate correlation analysis showed that sleep disorders was negatively correlated with serum Alb (r = -0.606, P = 0.000) and positively correlated with RLS (r = 0.497, P = 0.001) and depression (r = 0.341, P = 0.029). Multivariate regression analysis revealed that the odds ratio of RLS, depression, and low serum Alb was 22.900, 42.209, and 0.597, respectively.

CONCLUSIONSThe prevalence of sleep disorders was relatively high in CAPD patients. RLS, depression, and low serum Alb were the risk factors for CAPD patients with sleep disorders.