The evolution and future directions of bypass surgery.

Area of Science:

• Neurosurgery
• Vascular Surgery

Background:

• Cerebral bypass surgery is a complex neurosurgical procedure with evolving applications beyond traditional arterial stenosis.
• Its use has declined due to endovascular therapies and studies questioning efficacy in carotid artery occlusion, yet it retains value for specific patient groups.

Purpose of the Study:

• To review the current role and evolving techniques of cerebral bypass surgery in neurosurgery.
• To highlight its continued importance in managing complex cerebrovascular conditions and hemodynamic impairments.

Main Methods:

• Review of the literature on cerebral bypass surgery, including its historical context, current applications, and recent innovations.
• Discussion of studies impacting its perceived efficacy and the rationale for its continued practice.

Main Results:

• Cerebral bypass is effective for moyamoya vasculopathy and selected cases of hemodynamic impairment refractory to medical management.
• Innovations like flow-regulated bypass and intraoperative flow assessment aim to improve safety and outcomes.

Conclusions:

• Despite a decrease in overall performance, cerebral bypass surgery remains a critical skill for neurosurgeons.
• It offers significant benefits for specific conditions, including moyamoya disease and complex aneurysms, tumors, and vascular malformations.
• Continued training is essential as bypass surgery will remain relevant for complex cerebrovascular cases.