Acute Effects of Cannabis Inhalation on Cardiac Ectopy, Physical Activity, Sleep, and Glucose.
Adi Elias, Gabrielle C Montenegro, Hannah H Oo et al.
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In 30 seconds
This prospective, randomized crossover trial examined acute effects of inhaled cannabis in adults who regularly smoked or vaped cannabis and had no history of cardiac arrhythmias. Across 108 participants and 14 days of daily assignment to cannabis inhalation or abstinence, inhalation was associated with a 9% reduction in daily ectopic beats (RR: 0.91; 95% CI: 0.85-0.98; P = 0.02), driven by fewer premature atrial contractions. Premature ventricular contractions did not change significantly, and there were no significant differences in step counts, sleep duration, or glucose levels.
Key findings
- Daily ectopic beats were 9% lower with assignment to inhaled cannabis (RR: 0.91; 95% CI: 0.85-0.98; P = 0.02).
- Premature atrial contractions decreased by 10% (RR: 0.90; 95% CI: 0.82-0.97; P = 0.012); premature ventricular contractions showed no significant change.
- No significant differences were observed in step counts, sleep duration, or glucose levels.
Why it matters
The trial adds randomized crossover evidence on short-term cardiac rhythm effects in habitual cannabis users, addressing a question previously informed largely by observational studies. Its finding of fewer ectopic beats, mainly atrial, does not establish that cannabis prevents clinically important arrhythmias or improves cardiovascular outcomes; the measured outcome was cardiac ectopy.
What to keep in mind
Adherence was moderate, and potential withdrawal effects and co-intervention limit interpretation of the causal mechanism. Participants were habitual users without a history of cardiac arrhythmias, limiting generalizability.