A 12-year retrospective review of tetrodotoxin poisoning in Hong Kong

Introduction: Tetrodotoxin poisoning is typically caused by puffer fish consumption. This study is to review its demographics, clinical presentations and management in Hong Kong. Method: Reported cases of tetrodotoxin poisoning to Hong Kong Poison Information Centre from October 2008 to March 2021 were included in the study. Information from electronic database was analysed. Results: Forty-two cases were included in this case series. The number of incidents of tetrodotoxin poisoning ranged from 0 to 5 per year, mostly in the winter months. Median ingestion-to-symptom and ingestion-to-door time was 2 and 6.5 h, respectively. 48% of puffer fish meal sharer was symptomatic and attended emergency department. 100% and 48% of all cases had neurological and cardiovascular/gastrointestinal symptoms, respectively. Fukuda and Tani clinical Grade 1 and 2 were the most common presentation. 17% required intensive care while most patients were managed safely in emergency department and/or emergency medicine ward. Conclusion: There are recurrent incidents of tetrodotoxin poisoning in Hong Kong. Public education is the key to prevent future outbreaks. Targeted history and enhanced availability of tetrodotoxin test would assist in its diagnoses.