A 22-year-old with cannabinoid hyperemesis syndrome died from a cardiac arrhythmia triggered by vomiting | Research

The takeaway

A young woman with a 3.5-year history of cyclic vomiting and cannabis use died after developing torsades de pointes cardiac arrhythmia, linked to vomiting-induced hypokalemia and QT-prolonging medications.

Emergency physicians, gastroenterologists, cardiologists, and clinicians managing cannabinoid hyperemesis syndrome.

Fatal cardiac arrhythmia from vomiting-induced electrolyte depletion in CHS

What the researchers found

Death was attributed to fatal cardiac arrhythmia (torsades de pointes) complicating vomiting-induced hypokalemia in the context of cannabinoid hyperemesis syndrome, with contributing factors including QT-prolonging medications (haloperidol, ondansetron) and cardiac genetic mutations (MYBPC3 and RYR2).

Why it matters

This case demonstrates that cannabinoid hyperemesis syndrome can be fatal, not from the vomiting itself but from the downstream electrolyte disturbances and drug interactions that vomiting creates.

The numbers in context

Patient age: 22. Cannabis use since age 14. Cyclic vomiting history: 3.5 years. Time to brain death: 4 days post-cardiac arrest. Genetic mutations identified: MYBPC3 and RYR2.

How the study worked

Case report with complete postmortem examination including histopathology, toxicology, and genetic testing. Clinical course documented from emergency department admission through brain death declaration 4 days later.

What this study cannot tell us

Single case with multiple contributing factors (electrolyte disturbance, QT-prolonging drugs, genetic mutations), making it difficult to isolate any single cause.

How to read the evidence

Thorough case report with complete postmortem workup, but single case with multiple confounders.

When this study was published

Published in 2021.

The bigger picture

CHS is often considered a nuisance condition, but this case illustrates a potentially fatal cascade: severe vomiting causes electrolyte depletion, which combined with certain medications can trigger lethal heart rhythms.

Questions still open

Should QT-prolonging anti-emetics be avoided in CHS patients? How common are undiagnosed cardiac channelopathies among CHS patients?

Common questions

Can cannabinoid hyperemesis syndrome be fatal?

While rare, this case shows CHS can lead to death when severe vomiting causes dangerous electrolyte imbalances, especially when combined with medications that affect heart rhythm.

What medications contributed to the fatal outcome?

Haloperidol and ondansetron, both commonly used to treat nausea, can prolong the QT interval and increase the risk of dangerous heart rhythms, especially when potassium is low from vomiting.

Read the original research

Death of a young woman with cyclic vomiting: a case report.

Forensic science, medicine, and pathology, 17(4), 715-722

View on PubMed ↗Publisher’s paper ↗

Citation

von Both, Ingo; Santos, Brittini. (2021). Death of a young woman with cyclic vomiting: a case report.. Forensic science, medicine, and pathology, 17(4), 715-722. https://doi.org/10.1007/s12024-021-00410-z