Prevalence of chronic kidney disease in patients with suspected sleep apnoea.

Background: Little is known about the epidemiology of chronic kidney disease (CKD) in patients with suspected sleep apnoea (SA).

Methods: Glomerular filtration rate (eGFR) was calculated in consecutive patients referred for full-night observed in-hospital polysomnography. SA was defined as the respiratory disturbance index (RDI) > 5.