Abstract Number: Esoc2026a1924 Long-term Outcomes of Conservatively Managed Unruptured Brain Arteriovenous Malformations: a Single-center Retrospective Cohort Study
Year: 2026
Type: conference-abstract
Abstract: Background and aims Unruptured brain arteriovenous malformations (bAVMs) are traditionally associated with an annual haemorrhage risk of 2–4%. ARUBA trial on the management of unruptured bAVM reported superior outcomes with conservative management. This study aimed to assess long-term clinical outcomes and risk factors for intracranial haemorrhage (ICH) in conservatively managed unruptured bAVMs. Methods In this single-centre retrospective cohort study, patients with unruptured bAVMs were initially managed conservatively. The primary outcome was de novo ICH during follow-up. Secondary outcomes included mortality, new neurological symptoms, need for intervention, and functional status. Results A total of 126 patients (mean age 44.8 years) were included, with 700 person-years of follow-up. AVM diameter was <3 cm in 77 (61%), 3–6 cm in 46 (37%), and >6 cm in 3 (2%) patients. Twelve first ICH events occurred, yielding an incidence rate of 1.71 per 100 person-years (95% confidence interval [CI], 0.75–2.68). Seven patients (5.6%) died, six due to ICH. In univariable Cox analyses, flow-related aneurysms (hazard ratio [HR] 9.49, 95% CI 2.86–31.44) and AVM diameter ≥6 cm (HR 10.42, 95% CI 1.18–91.82) were associated with increased ICH risk. Most patients remained clinically and functionally stable; eight patients (6.3%) required intervention during follow-up, including four after ICH. Conclusions In this real-world cohort of conservatively managed unruptured bAVMs, long-term ICH risk was low. Large AVM diameter and flow-related aneurysms were potential risk factors, supporting conservative management in line with the ARUBA trail, while highlighting the need for individualized risk stratification. Conflict of interest Danae Kingma: nothing to disclose
Source: European Stroke Journal
Institution: Amsterdam University Medical Centers
Language: English
Subfield: Neurology
Field: Medicine
Domain: Health Sciences
Open Access status: hybrid
Estimated APC paid: $4,400
OpenAlex ID: W7160409337
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