Vascular stability of brain arteriovenous malformations after partial embolization

Area of Science:

• Neurology
• Vascular Surgery
• Interventional Radiology

Background:

• Brain arteriovenous malformations (bAVMs) pose a significant rupture risk, potentially exacerbated by partial embolization.
• Vascular stability metrics are crucial for assessing bAVM rupture risk.

Purpose of the Study:

• To analyze vascular stability in patients with bAVMs following partial embolization.
• To identify key biomarkers and temporal changes related to bAVM vascular stability post-embolization.

Main Methods:

• Comparative study of 24 patients undergoing partial embolization (short, medium, long-term groups) and 9 controls (surgery alone).
• Assessment of hemodynamic changes via angiogram.
• Evaluation of inflammatory infiltrates (MMP-9), cell-cell junctions (VE-cadherin), proliferation (VEGFA, eNOS), apoptosis (caspase-3), neovascularity (CD31), and apoptotic cells (TUNEL staining).

Main Results:

• Partial embolization increased bAVM blood flow velocity.
• The medium-term group (1-28 days post-embolization) exhibited the highest MMP-9, lowest VE-cadherin, highest VEGFA, eNOS, and neovascularity, along with increased caspase-3 and apoptotic cells.
• Biomarkers for bAVM vascular stability showed significant abnormalities within the 1-28 day period.

Conclusions:

• Partial embolization of bAVMs leads to dynamic changes in vascular stability markers.
• The period between 1 and 28 days post-partial embolization is critical, showing the most pronounced alterations in vascular stability biomarkers.
• These findings highlight a key temporal window for monitoring and potentially intervening to mitigate rupture risk.