Re-Evaluating Clinical Outcomes for AVM Stereotactic Radiosurgery

Area of Science:

• Neurosurgery
• Radiation Oncology
• Neurology

Background:

• Traditional outcomes for stereotactic radiosurgery (SRS) in cerebral arteriovenous malformations (AVMs) focus on angiographic obliteration and general complications.
• Existing grading scales predict obliteration based on AVM and patient factors.
• A clinically relevant goal is the avoidance of neurological sequelae, such as stroke or death.

Purpose of the Study:

• To re-evaluate clinical outcomes for SRS in AVM management.
• To emphasize patient-centered outcomes like stroke and death avoidance.
• To align outcome assessment with natural history data.

Main Methods:

• Review of historical outcomes data for SRS in AVMs.
• Analysis of long-term stroke and death rates following SRS.
• Comparison of SRS outcomes with non-interventional natural history data.

Main Results:

• Long-term stroke or death rates after SRS for AVMs are 1.5-2.0% annually for the first 5 years, decreasing to 0.2-0.4% annually thereafter.
• Focusing on stroke and death provides a more practical and patient-oriented outcome measure.
• This approach facilitates direct comparison with natural history data.

Conclusions:

• Clinical outcomes for AVM SRS should prioritize the avoidance of stroke and death.
• Patient-centered outcomes are more clinically useful than angiographic obliteration alone.
• Re-evaluating outcome metrics enhances the clinical utility and patient relevance of SRS data.