Weight loss and sleep-disordered breathing in childhood obesity : effects on inflammation and uric acidWeight loss and sleep-disordered breathing in childhood obesity : effects on inflammation and uric acid
Faculty of Medicine and Health Sciences
Laboratory Experimental Medicine and Pediatrics (LEMP)
2012Silver Spring, Md, 2012
Obesity. - Silver Spring, Md
20(2012):1, p. 172-177
University of Antwerp
Sleep-disordered breathing (SDB) is prevalent in childhood obesity. It may be an independent risk factor for the metabolic syndrome. Possible mechanisms are inflammation and oxidative stress. Adenotonsillectomy in childhood obesity is associated with a high recurrence rate and risk of postoperative weight gain. Therefore, this study assessed the effects of SDB on inflammation and oxidative stress in childhood obesity before and after weight loss. We included 132 obese subjects between 10 and 18 years consecutively. Median age was 15.4 years (10.118.0). Mean BMI z-score was 2.72 ± 0.42. Leukocytes and differentiation, high sensitivity C-reactive protein (hs-CRP), and uric acid (UA) were determined at baseline and subjects underwent a sleep assessment. SDB was diagnosed in 39%. Linear regression analysis showed an association between UAlog and oxygen desaturation indexlog (ODIlog) (r = 0.20; P = 0.03), between leukocyteslog and respiratory disturbance indexlog (RDIlog) (r = 0.23; P = 0.01), and between lymphocyteslog and RDIlog (r = 0.19; P = 0.04). Follow-up was organized after 46 months of treatment. Median decrease in BMI z-score was 32%. Laboratory measurements were repeated. Subjects with SDB at baseline underwent a second sleep study. Of these 49 subjects, 12 showed residual SDB. This corresponds with a treatment success rate of 71%. Unlike changes in inflammatory markers, improvements in UA were associated with improvements in RDI and ODI (respectively: r = 0.44; P = 0.007, r = 0.41; P = 0.01). In conclusion, weight loss is effective in treating obese children with SDB. At baseline, a link exists between inflammation and SDB. Oxidative stress is reflected by UA at baseline and the concentration decreases after treatment according to improvements in SDB.