Treatment of Charles Bonnet Syndrome with Continuous Positive Airway Pressure in an Older Adult

IntroductionCharles Bonnet syndrome (CBS) is a disorder in older adults, and is characterized by a triad of recurrent vivid visual hallucinations, ocular pathology causing visual impairment due to lesions in central or peripheral visual pathways, and normal cognitive status. It is often misdiagnosed as a psychosis, early dementia or a drug related condition. Hypoxemia was anecdotally reported as a cause of CBS.ObjectivesWe present an older adult with CBS caused by severe obstructive sleep apnea syndrome.AimsTo report a case study, describing treatment of obstructive sleep apnea syndrome as a cause of CBS.MethodsA case study is presented and discussed.ResultsAn older male adult was admitted to hospital for persistent vivid visual hallucinations. There was no personal or family history of mental illness. Neurological examination was normal, except for visual impairment due to age related macular degeneration. The remainder of his physical examination was normal. Previous treatment with antipsychotics proved not to be effective. Severe hypoxemia (SaO2 79%) was diagnosed with overnight pulse oximetry and subsequent polysomnography revealed an obstructive sleep apnea syndrome. After three nights of nasal continuous positive airway pressure, the vivid hallucinations ceased.ConclusionPhysicians need to understand the underlying causes and mechanisms of CBS. One should be aware of the importance of a full clinical examination and sleep apnea research in elderly persons with visual impairment.Disclosure of interestThe authors have not supplied their declaration of competing interest.