Autopsy Patterns Reveal How Recreational Drugs Damage the Sudden-Death Heart

A systematic review published in the Egyptian Journal of Forensic Sciences has mapped the pathological cardiac findings that appear at autopsy when sudden cardiac death is linked to recreational drug use. The review, conducted by researchers Ghadeer M. M. Abdelaal, Hanan Hosny Hassan, and Dena Mohamed Naguib Abdel Moawed, synthesized eighteen eligible studies covering alcohol, cocaine, methamphetamine, novel synthetic opioids, nicotine, cannabis, and anabolic steroids. Its central observation is that cardiac enlargement, in the form of cardiomegaly or ventricular hypertrophy, was the most frequently reported abnormality, appearing in thirteen of the eighteen included studies. Myocardial fibrosis ranked second, identified in nine studies, while coronary atherosclerosis and myocardial infarction or ischemic myocardial injury each surfaced in five studies.

The authors searched PubMed, Web of Science, and Scopus, running an initial literature search from March to April 2025 and an updated search in September 2026 to capture newly published eligible work. The search combined controlled vocabulary terms and free-text keywords covering sudden cardiac death, recreational drug use, and autopsy or postmortem findings. Eligible studies were case reports, case series, and retrospective case series published in English between 2000 and 2026 that reported relevant pathological cardiac findings in recreational drug-related sudden cardiac death. Studies lacking autopsy findings or involving non-cardiac deaths were excluded, as were reviews, case-control studies, systematic reviews, meta-analyses, animal studies, and in vitro work.

The study selection process was demanding. The database search initially returned 103 articles after filters for case reports and case series, the 2000 to 2025 publication window, and English language. After five duplicates were removed, the authors screened 98 titles and abstracts, advancing 35 papers to full-text screening. Seventeen articles survived that screening and quality assessment, and the September 2026 update added one more, bringing the final total to eighteen. Two independent authors performed screening using Rayyan software, with a third author resolving conflicts. Methodological quality was appraised with the Joanna Briggs Institute critical appraisal checklists appropriate to each design, using eight-question checklists for case reports and ten-question checklists for case series.

The composition of the evidence base was uneven across substances. The review identified one case series on alcohol, two case reports on cocaine, five studies on methamphetamine comprising three case reports and two case series, one case series on novel opioids, two case reports on nicotine, four studies on cannabis comprising three case reports and one case series, and three studies on anabolic steroids comprising two case reports and one case series. The authors stress that the strength of the evidence varied by design. Cocaine, nicotine, cannabis, and anabolic steroid findings came mostly from isolated case reports, whereas methamphetamine findings appeared in both case reports and larger case series and retrospective autopsy studies, and alcohol-related changes were reported in a relatively large case series.

Beyond frequency counts, the comparative synthesis revealed both shared and drug-specific pathological signatures. Cocaine and methamphetamine showed overlapping cardiotoxic effects, including myocardial hypertrophy, fibrosis, and arrhythmogenic changes, but methamphetamine was more strongly associated with chronic structural cardiac remodeling, while cocaine was more frequently linked to acute ischemic events and coronary thrombosis. Dilated cardiomyopathy was noted in four studies, specifically in research involving alcohol, methamphetamine, and novel opioids. Coronary thrombosis and contraction band necrosis each appeared in two studies. Cannabis-related deaths more often involved concurrent drug use and multifactorial processes rather than a single dominant cardiac lesion.

The substance-specific chapters of the review add technical detail. In alcohol-related sudden cardiac death, gross pathology of alcoholic dilated cardiomyopathy mirrors other dilated cardiomyopathies, with thin, pale ventricular walls, possible adherent thrombus in dilated regions carrying a risk of systemic embolization, and fibrosis patches along the ventricular and atrial myocardium and endocardium. Microscopy in one alcohol-related case showed focal lymphocytic infiltration within a relatively preserved myocardium, patchy endocardial thickening and fibrosis, chronic inflammation and diffuse interstitial fibrosis in places, and ultrastructural changes including enlarged, damaged sarcoplasmic reticulum within affected myocytes.

Cocaine produced a broader spectrum. Chronic use can leave some hearts entirely unremarkable while damaging others severely, with contraction band necrosis, cardiomyopathy, myocardial fiber disarray, and mononuclear cell infiltration among the reported abnormalities. In one reviewed case, microscopy of cardiac muscle from a cocaine toxicity death showed scattered contraction bands within otherwise normal cardiomyocytes, a pattern the authors attribute to catecholamine excess. Small foci of myocyte necrosis dispersed through the heart, accompanied by lymphocytic and macrophage infiltration with varying interstitial fibrosis, were interpreted as possible cocaine-induced myocarditis, potentially reflecting hypersensitivity reactions to cocaine or associated contaminants. Citing Lucena and colleagues, the review reports significant coronary atherosclerosis in 76 percent of cocaine-related sudden cardiac deaths, with atherosclerosis the leading cause of death in 28 percent, and notes cocaine’s association with intravascular thrombosis in coronary and peripheral arteries.

Methamphetamine and the opioids carried their own patterns. In one autopsy study cited within the review, 12 percent of hearts showed cardiomegaly and cardiac hypertrophy, and 39 percent of patients had atherosclerotic lesions in the aorta and coronary arteries; microscopy revealed patchy myocyte loss with contraction band necrosis, small hemorrhages, and neutrophil infiltration attributed to ischemic changes. A newly identified 2026 case report described cardiomegaly with dilated cardiomyopathy, myocardial necrosis, and right atrial perforation associated with methamphetamine exposure, with death caused by cardiac tamponade secondary to the perforation. For novel synthetic opioids, gross findings may include right ventricular dilation, left ventricular enlargement, localized papillary muscle necrosis from prolonged hypoxia, subendocardial hemorrhages, and fibrosis in the left bundle branches, while microscopy shows collagen fiber synthesis, fibroblast and histiocyte invasion, interstitial edema, and microvascular degeneration linked to hypoxia. One illustrated case showed subendocardial hemorrhage strictly confined to the subendocardium, confirmed both grossly after papillary muscle dissection and microscopically by collections of red blood cells beneath the endocardium.

Cannabis, nicotine, and anabolic steroids completed the picture. Observational findings cited in the review indicate that patients with ischemic coronary artery disease who consume marijuana face a 4.8-fold increased risk of myocardial infarction within the first 60 minutes, a 1.7-fold rise within the second hour, and a return to usual levels thereafter, with hemodynamic stress in a predisposed heart and possible reduced myocardial perfusion through altered microcirculation proposed as mechanisms. Autopsy findings in marijuana misuse are described as vague, with myocardial infarction and atheroma the most frequent findings; one illustrated cannabis-related case showed near-total coronary luminal occlusion by a fibrin-rich thrombus over mild arterial wall thickening with lipid deposition, indicating early atherosclerotic change. Nicotine stood out by contrast: the review found no significant pathological cardiac changes associated with nicotine in the included studies, although the authors note that smoking more broadly is a substantial risk factor for acute coronary thrombosis. For anabolic steroids, cardiomegaly and hypertrophy were the most often reported macroscopic abnormalities, with nuclear enlargement, cardiomyocyte widening, and interstitial fibrosis the most common histological findings, and hypertrophic cardiomyopathy described as a well-recognized arrhythmogenic substrate for sudden cardiac death even without an acute ischemic event.

The authors are explicit that these associations do not establish causation. Most of the available evidence consisted of descriptive case reports and case series, which inherently provide a low level of evidence. Several studies documented confounding variables, including pre-existing cardiovascular disease, alcohol use, cigarette smoking, and polydrug use, that may also have contributed to the identified pathological changes. Considerable heterogeneity in autopsy protocols, histopathological examinations, and toxicological analyses limited direct comparison across studies, some studies incompletely reported toxicological findings, and publication bias and language restrictions may have shaped the evidence base, since unusual or severe cases are more likely to be reported. The review protocol was also not prospectively registered. Within those limits, the authors conclude that a complete forensic examination integrating police records, medical reports, histological examination, and toxicological analysis remains essential for accurate postmortem diagnosis, that cardiac pathology can provide important supportive findings for interpretation, and that future work should establish multicenter forensic registries, standardized autopsy protocols, and integrated toxicological and histopathological workflows.

Subject of Research: Pathological cardiac findings at autopsy in recreational drug-related sudden cardiac death, synthesized through a systematic review of case reports and case series.

Article Title: Pathological cardiac changes associated with recreational drug-related sudden cardiac death: a systematic review

Article References: Abdelaal, G. M. M., Hassan, H. H., & Abdel Moawed, D. M. N. (2026). Pathological cardiac changes associated with recreational drug-related sudden cardiac death: a systematic review. Egyptian Journal of Forensic Sciences, 16(1), Article 94. https://doi.org/10.1186/s41935-026-00588-9

Image Credits: AI Generated

DOI: 10.1186/s41935-026-00588-9

Keywords: sudden cardiac death, recreational drugs, autopsy, cardiomegaly, myocardial fibrosis, cocaine, methamphetamine, cannabis, anabolic steroids, dilated cardiomyopathy, forensic pathology, systematic review