Urine levels of catecholamines in Greek children with obstructive sleep-disordered breathing.

Introduction: Adults with obstructive sleep apnea have increased sympathetic activity. It was hypothesized that in children with symptoms of obstructive sleep-disordered breathing (SDB), morning urine levels of catecholamines correlate with severity of nocturnal hypoxemia.

Methods: Children with snoring referred for polysomnography and controls without snoring were recruited.