Medical Cannabis for Chronic Pain Tied to Arrhythmia Risk

METHODOLOGY:

• To investigate, researchers identified 5391 patients with chronic pain (median age 59; 63% women) initiating first-time treatment with medical cannabis during 2018-2021 and matched them (1:5) to 26,941 control patients on age, sex, chronic pain diagnosis, and concomitant use of other noncannabis pain medication.
• They calculated and compared absolute risks for first-time arrhythmia (atrial fibrillation/flutter, conduction disorders, paroxysmal tachycardias, and ventricular arrhythmias) and acute coronary syndrome (ACS) between groups.

TAKEAWAY:

• Within 180 days, 42 medical cannabis users and 107 control participants developed arrhythmia, most commonly atrial fibrillation/flutter.
• Medical cannabis users had a slightly elevated risk for new-onset arrhythmia compared with nonusers (180-day absolute risk, 0.8% vs 0.4%).
• The 180-day risk ratio with cannabis use was 2.07 (95% CI, 1.34-2.80), and the 1-year risk ratio was 1.36 (95% CI, 1.00-1.73).
• Adults with cancer or cardiometabolic disease had the highest risk for arrhythmia with cannabis use (180-day absolute risk difference, 1.1% and 0.8%). There was no significant association between medical cannabis use and ACS risk.

IN PRACTICE:

"With the investigated cohort's low age and low prevalence of comorbidity in mind, the notable relative risk increase of new-onset arrhythmia, mainly driven by atrial fibrillation/flutter, could be a reason for concern, albeit the absolute risks in this study population were modest," the authors wrote.

"Medical cannabis may not be a 'one-size-fits-all' therapeutic option for certain medical conditions and should be contextualized based on patient comorbidities and potential vulnerability to side effects," added the author of an editorial.

SOURCE:

The study, led by Anders Holt, MD, Copenhagen University and Herlev-Gentofte Hospital, Hellerup, Denmark, was published online on January 11, 2024, in the European Heart Journal, with an editorial by Robert Page II, PharmD, MSPH, University of Colorado, Aurora.

LIMITATIONS:

Residual confounding is possible. The registers lack information on disease severity, clinical measures, blood tests, and lifestyle factors. The route of cannabis administration was not known.

DISCLOSURES:

The study was funded by external and independent medical research grants. Holt had no relevant disclosures. Some coauthors reported research grants and speakers' fees from various drug companies.

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