Abstract
Background and objective
Brain arteriovenous malformations (bAVMs) carry a risk of hemorrhage. We aim to identify factors associated with subsequent hemorrhages.
Methods
Systematic searches were conducted across the ScienceDirect, Medline, and Cochrane databases. Assessed risk factors included bAVM size, bAVM volume, hemorrhage and seizure presentations, presence of deep venous drainage, deep-seated bAVMs, associated aneurysms, and Spetzler–Martin grade. Subgroup analyses were conducted on prior treatments, hemorrhage presentation, AVM size, and type of management.
Results
The meta-analysis included 8 cohort studies and 2 trials, with 4,240 participants. Initial hemorrhage presentation (HR 2.41; 95% CI 1.94–2.98; p < 0.001), any deep venous drainage (HR 1.52; 95% CI 1.09–2.13; p = 0.01), and associated aneurysms (HR 1.78; 95% CI 1.41–2.23; p < 0.001) increased secondary hemorrhage risk. Conversely, higher Spetzler–Martin grades (HR 0.77; 95% CI 0.68–0.87; p < 0.001) and larger malformation volumes (HR 0.87; 95% CI 0.76–0.99; p = 0.04) reduced risk. Subgroups showed any deep venous drainage in patients without prior treatment (HR 1.64; 95% CI 1.25–2.15; p < 0.001), bAVM > 3 cm (HR 1.79; 95% CI 1.15–2.78; p = 0.01), and multimodal interventions (HR 1.69; 95% CI 1.12–2.53; p = 0.01) increased risk. The reverse effect was found for patients initially presented without hemorrhage (HR 0.79; 95% CI 0.67–0.93; p = 0.01). Deep bAVM was a risk factor in > 3 cm cases (HR 2.72; 95% CI 1.61–4.59; p < 0.001) and multimodal management (HR 2.77; 95% CI 1.66–4.56; p < 0.001). Kaplan–Meier analysis revealed increased hemorrhage risk for initial hemorrhage presentation, while cumulative survival was higher in intervened patients over 72 months.
Conclusion
Significant risk factors for bAVMs hemorrhage include initial hemorrhage, any deep venous drainage, and associated aneurysms. Deep venous drainage involvement is a risk factor in cases without prior treatment, those with bAVM > 3 cm, and cases managed with multimodal interventions. Deep bAVM involvement also emerges as a risk factor in cases > 3 cm and those managed with multimodal approaches.
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Data availability
All data relevant to the study are included in the article or uploaded as supplementary information.
Abbreviations
- ARUBA:
-
A Randomized Trial of Unruptured Brain Arteriovenous Malformations
- bAVM:
-
Brain arteriovenous malformation
- CI:
-
Confidence interval
- CT:
-
Computed tomography
- HRs:
-
Hazard ratios
- MRI:
-
Magnetic resonance imaging
- NOS:
-
Newcastle–Ottawa scale
- PRISMA:
-
Preferred Reporting Items for Systematic Reviews and Meta-Analyses
- PROSPERO:
-
International Prospective Register of Systematic Reviews
- REML:
-
Restricted maximum likelihood
- RCT:
-
Randomized controlled trial
- SIVMS:
-
Steering Committee and the Oxford Vascular Study
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The authors also acknowledge the contribution of the Department of Neurology, Universitas Udayana for the supports given.
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BGdL: acquisition of data, analysis and interpretation of data, wrote the first draft, study supervision. AAIKA: analysis and interpretation of data, wrote the first draft. CPK: wrote the first draft. NAKP: critical revision of manuscript for intellectual content. KT: critical revision of manuscript for intellectual content. IPEW: study concept and design, critical revision of manuscript for intellectual content. ISP: critical revision of manuscript for intellectual content. BGdL is the guarantor.
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de Liyis, B.G., Arini, A.A.I.K., Karuniamaya, C.P. et al. Risk of intracranial hemorrhage in brain arteriovenous malformations: a systematic review and meta-analysis. J Neurol 271, 2274–2284 (2024). https://doi.org/10.1007/s00415-024-12235-1
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DOI: https://doi.org/10.1007/s00415-024-12235-1