Cerebral revascularization by EC-IC bypass--present status.

Area of Science:

• Neurosurgery
• Vascular Surgery
• Neurology

Background:

• Extra-Intracranial Arterial Bypass (EIAB) was developed to treat brain artery blockages inaccessible to other surgeries.
• The International EC-IC Bypass Study led to a decline in EIAB procedures due to lack of improved long-term results compared to aspirin.
• Evolving understanding of cerebral ischemia has led to refined indications for EIAB.

Purpose of the Study:

• To re-evaluate the role of EIAB in managing cerebrovascular occlusive diseases.
• To explore advancements in EIAB techniques for improved patient outcomes.
• To address hemodynamic insufficiency and enhance brain blood supply in specific patient populations.

Main Methods:

• Review of historical EIAB procedures and outcomes.
• Analysis of recent technical improvements in EIAB surgery.
• Application of refined indications for hemodynamic insufficiency.
• Consideration of variations like encephalo-myo-synangiosis for moyamoya disease.

Main Results:

• Initial studies showed no significant benefit of EIAB over medical therapy in the general study population.
• Improved understanding of ischemic events allows for more precise patient selection.
• Technical advancements enable high-flow bypass and "occlusion-free" anastomoses.
• Variations of EIAB techniques offer additional blood supply for moyamoya disease.

Conclusions:

• EIAB remains a valuable option for specific cerebrovascular conditions, particularly when addressing hemodynamic insufficiency.
• Refined surgical techniques and patient selection criteria enhance the efficacy of EIAB.
• EIAB, including its variations, can significantly improve brain perfusion in select patients.