High-grade arteriovenous malformations and their management.

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.