Participants
psychiatric, convulsions, CRPS
DISORDER
Eligible participants were aged 18–75 years with chronic (≥ 6 months since onset of symptoms) CRPS according to the Budapest Criteria, as judged by the investigator at the screening visit [Individuals who met any of the following criteria were not eligible for study entry: current or planned use of ketamine, or use (intravenous or oral) within the previous 6 weeks; unstable or clinically significant neurological, psychiatric, cardiovascular, or another condition that might have an impact on their ability to participate in the study or potentially confound the study results; history of convulsions or an increased risk of convulsions; and any history of alcohol, opioid, or moderate-to-severe substance use disorder.