Characteristics, presentation and outcomes of music festival patrons with stimulant drug-induced serotonin toxicity.

OBJECTIVE A large number of stimulant drug-associated deaths at music festivals in Australia were reported during the southern hemisphere summer of 2018-2019. This led to the prehospital deployment of healthcare professional-led critical care response teams. We aimed to describe the characteristics, clinical presentation, management and outcomes of music festival patrons with stimulant drug-induced serotonin toxicity managed using this model during the study period. METHODS We performed a retrospective observational study of patients presenting with stimulant drug-induced serotonin toxicity and/or drug-induced hyperthermia who presented between December 2017 and December 2019. Comprehensive follow-up data were collected for those patients who required hospital admission. Data included demographics, clinical features, management and disposition, hospital outcomes and laboratory data, stratified by severity of presentation. RESULTS Forty-seven patients were included. Median age was 21.9 years (interquartile range 19.6-22.2). 3,4-Methylenedioxymetamphetamine was the most frequently reported agent ingested (32/47). After stratification, 13 of 47 patients were classified as mild, 20 of 47 as moderate and 14 of 47 as severe. Median presenting temperature in this latter cohort was 41.1°C (40.5-42.0°C). All severely ill patients required intensive care unit admission, with a median hospital stay of 4.63 days (interquartile range 2.08-8.36). End-organ complications were reported in 11 of 14 patients. No mortalities were reported. All patients (13/13) from the mild cohort and 15 of 20 patients from the moderate cohort were treated and discharged on-site. CONCLUSIONS Severe illness was associated with a high incidence of end-organ impairment. A high proportion of patients without severe disease were able to be successfully managed at the event without transport to hospital. No deaths are reported in this series.