What topics does this cannabis study cover?

This study covers research on: Neuroprotection.

Where was this research published?

Published in Neurosurgical review on April 23, 2026.

Neuroprotection

Alcohol increases aneurysm rupture risk, but THC shows no effect

Recreational substance use and aneurysmal subarachnoid hemorrhage: differential effects of alcohol and THC.

Neurosurgical review • April 23, 2026 • Moderately Relevant

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AI Summary

This German study examined how recreational substance use affects brain aneurysm rupture risk and severity in nearly 1,000 patients. Researchers found that risky alcohol consumption (more than 20g daily for men, 10g for women) significantly increased both the likelihood of aneurysm rupture and the severity of bleeding. Patients with risky drinking patterns had double the risk of aneurysm rupture and more than three times the risk of severe clinical presentation. Interestingly, THC use showed no significant association with either aneurysm rupture or bleeding severity, suggesting cannabis may have a fundamentally different cardiovascular profile than alcohol in this context.

The study included 954 patients with intracranial aneurysms treated between 2016 and 2023, with detailed substance use documented through structured interviews. Clinical severity was assessed using established neurological scales, allowing researchers to distinguish between the risk of rupture and the severity of bleeding when rupture occurred. While risky alcohol use was present in only 4.6% of patients, its association with worse outcomes was strong and independent of other risk factors. THC use (5.3% of patients) and combined substance use showed no significant protective or harmful effects, meaning THC use alone did not increase aneurysm rupture risk or bleeding severity in this population.

These findings have important implications for patient counseling and prevention strategies. Clinicians should actively address alcohol consumption with patients at risk for aneurysm complications, while reassuring THC users that cannabis use alone does not appear to increase their aneurysm rupture risk based on current evidence. However, researchers note that larger and longer studies are needed to fully clarify the role of THC and other cannabinoids, particularly given the increasing prevalence of cannabis use worldwide.

📄 Original Abstract

Objective: The use of recreational drugs such as alcohol and tetrahydrocannabinol(THC) is increasing worldwide. While tobacco and certain illicit substances are well-established risk factors for aneurysmal subarachnoid hemorrhage (aSAH), the role of alcohol and THC remains less well defined. Understanding their potential impact on aneurysm rupture and clinical severity could have significant implications for prevention and patient management. This study aimed to investigate the influence of alcohol and THC use on the risk of intracranial aneurysm(IA) rupture and the clinical severity of aSAH. Methods: We prospectively included 954 patients with IA treated at a tertiary center in Germany between 2016 and 2023. Alcohol and drug use were documented through structured interviews. Risky alcohol use was defined as >20g/day(males) and >10g/day (females). Clinical severity of aSAH was assessed using the World Federation of Neurological Surgeons(WFNS) scale; radiographic severity was classified using the modified Fisher scale. Univariate and multivariate analyses were performed to evaluate associations between substance use, IA rupture, and severity. Results: Risky alcohol consumption was reported in 4.6% of patients, THC use in 5.3%, and polytoxicomania use in 3.2%. Risky alcohol consumption was independently significantly associated with IA rupture (adjusted odds ratio[aOR]2.00,95%,CI 1.07–3.75,p=0.031) and clinically severe aSAH (WFNS grade IV-V:aOR 3.26,95%,CI 1.34–7.95,p=0.009). No significant associations were observed for THC or polytoxicomania. Conclusions: Risky alcohol consumption was independently associated with the risk of IA rupture and more severe clinical presentation of aSAH. THC use showed no significant effect. Alcohol use should be actively addressed in IA patient counseling, and further studies are warranted to clarify the role of THC. The online version contains supplementary material available at 10.1007/s10143-026-04295-w.

Paper Type

📄 Research

Publication

Journal: Neurosurgical review
Published: April 23, 2026
PMID: 42020885
DOI: 10.1007/s10143-026-04295-w

Authors (13)

Marvin Darkwah Oppong Department of Neurosurgery and Spine Surgery, University Hospital Essen, University of Duisburg-Essen, Essen, Germany. marvin.darkwahoppong@uk-essen.de.
Annika Witte Department of Neurosurgery and Spine Surgery, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.
Philipp Dammann Department of Neurosurgery and Spine Surgery, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.
Argtim Rexhepi Department of Neurosurgery and Spine Surgery, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.
Yahya Ahmadipour Department of Neurosurgery and Spine Surgery, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.
+8 more authors