Three cases of cardiac arrest linked to cannabis use, including in young people without risk factors | Research

The takeaway

Three patients collapsed with severe cardiac events after cannabis use, including coronary vasospasm, dual coronary artery occlusion, and ventricular fibrillation, suggesting cannabis can trigger life-threatening cardiovascular events.

Read this if you want to understand the potential cardiovascular risks of cannabis use.

Three distinct cardiovascular mechanisms triggered cardiac arrest in cannabis users

What the researchers found

Researchers reported three cases where recent or chronic cannabis use preceded cardiac arrest requiring CPR. Each case involved a different cardiovascular mechanism:

The first patient presented with asystole and was found to have diffuse coronary vasospasm after acute cannabis use. The second, a young patient without known cardiovascular risk factors, had an acute heart attack with occlusion of two coronary arteries during chronic cannabis use. The third presented with ventricular fibrillation from a coronary artery occlusion.

All three patients had recent cannabis use confirmed by history and toxicological screening showed no other substance use besides cannabis.

Why it matters

The cardiovascular risks of cannabis are often underappreciated. These cases demonstrated that cannabis-associated cardiac events can occur through multiple mechanisms and can affect young people without any pre-existing cardiovascular risk factors.

The numbers in context

Three patients. Three distinct cardiovascular mechanisms: coronary vasospasm, dual coronary artery occlusion, and ventricular fibrillation. All required CPR with restoration of spontaneous circulation.

How the study worked

Case series of three patients who experienced cardiac arrest requiring CPR, each with confirmed recent cannabis use and negative toxicological screening for other substances. Clinical details including coronary angiography findings were reported.

What this study cannot tell us

Case reports cannot prove causation. Three cases is a very small number. Other undetected factors may have contributed. The frequency of these events among all cannabis users is unknown and likely very low.

How to read the evidence

Case series of three patients. Illustrative but cannot establish incidence or causation.

When this study was published

Published in 2014.

The bigger picture

While case reports cannot establish population-level risk, the occurrence of multiple mechanisms of cardiovascular harm (vasospasm, thrombosis, arrhythmia) in cannabis users raises concerns that deserve systematic study. As cannabis use becomes more prevalent, these rare but serious events may become more common.

Questions still open

How common are serious cardiovascular events among cannabis users? Does chronic vs. acute use carry different risks? Which cardiovascular mechanism is most frequently triggered by cannabis? Are there genetic or other factors that predispose certain users to cardiovascular events?

Common questions

Can cannabis cause a heart attack?

These three cases documented cardiac events (including heart attack) in cannabis users. However, case reports cannot establish how common this is. Population-level risk studies suggest the absolute risk is likely low but may be relevant for individuals with cardiovascular vulnerability.

Are young people at risk for cannabis-related heart problems?

One of the three cases involved a young patient without known cardiovascular risk factors who experienced acute coronary artery occlusion. While rare, this suggests age and absence of risk factors do not provide complete protection.

Read the original research

Is recent cannabis use associated with acute coronary syndromes? An illustrative case series.

Acta cardiologica, 69(2), 131-6

View on PubMed ↗

Citation

Casier, Isabelle; Vanduynhoven, Philippe; Haine, Steven; Vrints, Chris; Jorens, Philippe G. (2014). Is recent cannabis use associated with acute coronary syndromes? An illustrative case series.. Acta cardiologica, 69(2), 131-6.