A review of molecular, clinical, and forensic evidence shows cannabinoids can disturb heart electrical activity and reveal latent genetic heart rhythm disorders, potentially causing sudden cardiac death.
cardiologists, forensic pathologists, emergency medicine clinicians, cannabis regulators
What the researchers found
Cannabinoids affect calcium and potassium currents through both receptor-dependent and -independent pathways, alter autonomic regulation, and promote oxidative stress and inflammation in heart tissue. Genetic variants in SCN5A, KCNH2, KCNQ1, RYR2, and NOS1AP can create subclinical vulnerabilities that become lethal when combined with cannabinoid-induced electrical disruptions, especially from high-potency synthetic cannabinoids.
Why it matters
Most cannabis safety discussions focus on mental health or respiratory effects. This review highlights an underappreciated cardiovascular risk, particularly for people with undiagnosed genetic heart conditions who may not know they are at elevated risk.
The numbers in context
Key genes: SCN5A, KCNH2, KCNQ1, RYR2, NOS1AP. Cannabinoids affect calcium and potassium currents. Synthetic cannabinoids pose highest risk. Forensic cases document sudden cardiac death linked to cannabinoid exposure in genetically vulnerable individuals.
How the study worked
Meta-narrative review consolidating molecular, clinical, epidemiological, and forensic evidence linking cannabinoid exposure to arrhythmias and sudden cardiac death, including analysis of genetic risk factors.
What this study cannot tell us
Narrative review without systematic methodology. Many findings based on case reports and forensic analyses. Prevalence of cannabinoid-triggered cardiac events is unknown. Genetic testing is not widely available or standardized for this purpose.
How to read the evidence
Comprehensive integration of molecular, clinical, and forensic evidence across multiple disciplines, though largely based on case reports and mechanistic data rather than population studies.
When this study was published
Contemporary review of current evidence.
The bigger picture
The review advocates for a paradigm shift toward personalized risk assessment, combining genetic screening, ECG monitoring, and controlled cannabinoid dosing. While rare, cannabinoid-triggered cardiac events in genetically susceptible individuals represent a preventable cause of sudden death.
Questions still open
- Should genetic screening for channelopathies be recommended before cannabis use?
- How common are cannabinoid-triggered cardiac events in the general population?
Common questions
Can cannabis cause a heart attack?
Who is most at risk?
Read the original research
A Meta-Narrative Review of Channelopathies and Cannabis: Mechanistic, Epidemiologic, and Forensic Insights into Arrhythmia and Sudden Cardiac Death.
International journal of molecular sciences, 26(17)
Citation
Šoša, Ivan. (2025). A Meta-Narrative Review of Channelopathies and Cannabis: Mechanistic, Epidemiologic, and Forensic Insights into Arrhythmia and Sudden Cardiac Death.. International journal of molecular sciences, 26(17). https://doi.org/10.3390/ijms26178635
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