Objective To investigate the relationships in plasma uric acid levels between patients with Parkinson disease(PD) and rapid-eye-movement sleep behavior disorder(RBD). Methods Thirty-nine patients with idiopathic RBD(i RBD group), 43 patients with PD(PD group) and 128 healthy controls(healthy control group) were collected from Xuanwu Hospital, Capital Medical University from March 2016 to March 2017. All patients with i RBD were confirmed by clinical assessment and polysomnography. Subjects' plasma uric acid...