Extracranial surgery for the low-flow-endangered brain

Area of Science:

• Vascular Surgery
• Neurology
• Cerebrovascular Disease

Background:

• Severe carotid stenosis or occlusion affects cerebrovascular supply.
• Bilateral carotid disease presents unique management challenges.
• Distinguishing low-flow from embolic transient ischemic attacks (TIAs) is crucial.

Purpose of the Study:

• To evaluate the effectiveness of improving carotid inflow in patients with severe bilateral carotid disease.
• To determine the optimal surgical strategy for managing severe bilateral carotid stenosis/occlusion.
• To assess the role of ocular pneumoplethysmography (OPG) in managing these patients.

Main Methods:

• Angiography to diagnose severe bilateral carotid stenosis (>75% area reduction).
• Ocular pneumoplethysmography (OPG) performed preoperatively and postoperatively.
• Analysis of OPG changes following unilateral carotid surgery in 39 patients.
• Evaluation of patients undergoing bilateral procedures.

Main Results:

• Improved carotid inflow was associated with positive OPG changes post-surgery.
• OPG studies provided evidence supporting inflow restoration as the primary goal.
• Extracranial-intracranial bypass was effective in a subset of patients with poor collateral flow.

Conclusions:

• Prioritizing major carotid inflow augmentation is essential for patients with severe bilateral carotid disease.
• Distal extracranial-intracranial reconstruction should be reserved for select cases unresponsive to improved inflow.
• OPG is a valuable tool for assessing the hemodynamic significance of carotid stenosis and surgical outcomes.