Identifying high-risk asymptomatic carotid stenosis.

Area of Science:

• Vascular Surgery
• Neurology
• Cardiology

Background:

• Medical therapy advancements have reduced stroke risk in asymptomatic carotid stenosis (ACS).
• Current stroke risk with medical therapy is lower than with surgical intervention for most ACS patients.
• Identifying the ~10% of high-risk ACS patients who benefit from intervention is crucial.

Purpose of the Study:

• To review evidence on the comparative risks of medical therapy versus intervention for ACS.
• To evaluate methods for identifying high-risk ACS patients who may benefit from intervention.

Main Methods:

• Review of evidence comparing medical therapy and intervention risks for ACS.
• Assessment of diagnostic approaches including transcranial Doppler, ultrasound, MRI, PET/CT, and cerebral blood flow reserve.

Main Results:

• Most patients (~90%) with ACS achieve better outcomes with intensive medical therapy.
• Specific high-risk indicators for intervention include microemboli, multiple plaque ulcers, and unstable plaque features.

Conclusions:

• Carotid endarterectomy or stenting is indicated only for ACS patients with identified high-risk features.
• Features indicating intervention include microemboli, 3D ultrasound-detected ulcers, plaque echolucency, intraplaque hemorrhage, inflammation, or reduced cerebral blood flow reserve.
• The majority of ACS patients are best managed with intensive medical therapy.