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High-grade arteriovenous malformations and their management
Richard D Ferch1, Michael K Morgan
1The North and West Cerebrovascular Unit, The University of Sydney, Sydney, Australia.
Insights
High-grade arteriovenous malformations (AVMs) carry significant surgical risks. Careful patient selection based on arterial supply is crucial for successful AVM treatment, balancing risks and benefits.
Area of Science:
- Neurosurgery
- Vascular Neurology
- Interventional Radiology
Background:
- High-grade arteriovenous malformations (AVMs) present complex management challenges.
- The Spetzler Martin grading scale stratifies AVM severity and guides treatment decisions.
Purpose of the Study:
- To compare outcomes of operative versus non-operative management for high-grade AVMs (Spetzler Martin grades 4 and 5).
- To identify specific risk factors associated with surgical morbidity in high-grade AVM patients.
Main Methods:
- Retrospective analysis of 46 patients with high-grade AVMs (grades 4-5) from a cohort of 391.
- Comparison of outcomes between 29 surgically treated patients and 17 conservatively managed patients.
- Assessment of functional decline, hemorrhage, neurological deficits, seizures, mortality, and morbidity impacting self-care.
Main Results:
- Non-operative management resulted in functional decline in 27% of cases due to hemorrhage, neurological deficits, or seizures.
- Surgical management had a 15% mortality and morbidity rate impacting self-care.
- Patients without deep perforating arterial supply had 10% morbidity, while those with deep perforating arterial supply or deep meningeal recruitment had a 44% combined morbidity and mortality (P<0.01).
Conclusions:
- High-grade AVMs are associated with substantial operative morbidity.
- Careful patient selection, particularly evaluating deep perforating arterial supply, can identify candidates who benefit from surgery.
- Grade 4 and 5 AVMs with deep arterial supply or meningeal recruitment may be better managed conservatively or with multimodality treatment.
Abstract:
The aim of this study was to compare operatively and non-operatively managed high-grade arteriovenous malformations (AVMs) and to identify risk factors for surgical morbidity. Three hundred and ninety-one consecutively enrolled patients with AVMs were graded using the Spetzler Martin grading scheme. Forty-six of these patients had grade 4 or 5 AVMs. Twenty-nine patients underwent surgery and 17 were conservatively managed. During an average of 33 months follow-up the non-operative group experienced a decline in function in 27% of cases followed. These deteriorations were due to haemorrhage, progressive neurological deficits and seizures. In the surgical group completing treatment there was a mortality and morbidity impacting on self-care of 15%. In those without deep perforating arterial supply the morbidity was 10% and with deep perforating arterial supply or deep meningeal recruitment there was a combined morbidity and mortality of 44%. This difference in outcome was statistically significant (P<0.01). We conclude that high-grade AVMs have a high operative morbidity. However, these lesions often have a poor natural history and with careful selection (based on the presence or absence of deep perforating arterial supply) a group can be selected that benefits from surgery. Grade 4 and 5 AVMs with supply from lenticulostriate, choroidal, thalamic deep perforating arteries or deep meningeal recruitment may be best treated conservatively or possibly by multimodality treatment utilising radiotherapy and embolisation combined with surgery.