Marijuana use and acute myocardial infarction: A systematic review of published cases in the literature

Background and objective: Marijuana use has gained popularity following legalization in the US. Marijuana can affect the heart through various mechanisms. This study aims to conduct a systematic review of published case reports of individuals with acute myocardial infarction (AMI) following marijuana use. Methods: We conducted a systematic review of literature, including case reports, case series, and the letter to the editor on MEDLINE. Forty-six studies were included, with a total number of 62 patients with AMI and marijuana use. Results: The mean age was 27.7 (±10.3) years with male predominance. About 3.7 g marijuana was used for an average of 9.7 years by the patients. From the cases reporting the onset of AMI symptoms, the average time was within 5 h after last marijuana use. The angiographic findings were normal in 36.8% of cases. In 42.1% of individuals, the left anterior descending coronary artery was occluded, making it the most common artery involved, followed by the right coronary artery (10.5%). Most cases were managed medically, followed by thrombectomy and stent placement, and percutaneous transluminal coronary angioplasty (PTCA). Complications included cardio-embolic stroke, and seven deaths were reported. Conclusion: It is important to consider episodic marijuana use as a significant risk factor of AMI, particularly in individuals with no cardiac risk factors, as delay in management can result in fatal outcomes including increased risk of mortality.