Epidemiology of Neurological Complications to Nitrous Oxide Poisoning

Inclusion Criteria

• •Adult patient (≥16 years)
• •Hospitalized or having consulted with the departments of Neurology or Internal Medicine for neurological phenomena related to the consumption of N2O. The neurological phenomena included are usually: neuropathies or myelopathies, However, the existence of other neurological or psychiatric signs is not a factor of exclusion: for example, headaches or cognitive or psychiatric disorders with acute onset.
• •Exposure to N2O for recreational or medical reasons (Meopa anesthesia).
• •Lack of alternative diagnosis other than N2O poisoning
• •Consultation for neurological disorders between 01/01/2018 and 31/12/2021