Carotid Artery Stenting (stroke prevention)
Carotid Artery Stenting (CAS)
Carotid Artery Stenting (CAS) is a minimally invasive procedure used to open a narrowed carotid artery—the primary blood vessel in the neck that supplies the brain. By using a metal mesh stent to widen the artery, this procedure restores healthy blood flow and significantly reduces the risk of a future stroke. It is often a preferred alternative to open surgery (endarterectomy) for patients with complex anatomy or high-risk medical conditions.
When You Should Consider Carotid Artery Stenting
Significant Stenosis: Blockage of more than 70% in patients without symptoms, or more than 50% in those with a history of mini-strokes (TIAs).
High Surgical Risk: Patients with severe heart or lung disease who may not tolerate the stress of traditional open neck surgery.
Difficult Anatomy: When the blockage is located too high or too low in the neck for a surgeon to reach safely with an incision.
Restenosis: For patients whose artery has narrowed again after a previous carotid endarterectomy.
Radiation-Induced Stenosis: When the narrowing is a result of prior radiation therapy to the neck, making the tissue difficult to operate on traditionally.
How Carotid Artery Stenting Is Performed
Vascular Access: A small puncture is made in the femoral artery (groin) or radial artery (wrist) to serve as the entry point for the catheters.
Embolic Protection Device (EPD): A tiny filter, shaped like an umbrella, is positioned past the blockage. This "safety net" catches any loose plaque fragments before they can travel to the brain.
Predilation (Angioplasty): A small balloon is guided to the site of the narrowing and inflated to prepare the area for the stent.
Stent Deployment: A self-expanding metal mesh tube is released across the blockage. It acts as a permanent scaffold, pressing the plaque against the artery walls to keep the vessel open.
Post-Dilation: The surgeon may inflate a balloon inside the newly placed stent to ensure it is fully expanded and snug against the artery wall.
Filter Removal: Once the stent is secure, the protection filter—along with any captured debris—is folded and removed from the body.
Pre-Procedure Preparation
Diagnostic Imaging: Confirmation of the blockage via Carotid Ultrasound, CT Angiogram (CTA), or MR Angiogram (MRA).
Dual Antiplatelet Therapy (DAPT): Taking Aspirin and Clopidogrel (Plavix) for 3–5 days prior is mandatory to prevent blood clots from forming on the new stent.
Fasting (NPO): No food or drink for 8–12 hours before the procedure.
Neurological Baseline: A thorough exam of speech, vision, and motor skills is conducted so the team can monitor for changes during the surgery.
Tests Before Carotid Artery Stenting
Carotid Duplex Ultrasound: A non-invasive test using sound waves to measure the speed of blood flow and the degree of narrowing.
CT Angiogram (CTA): Provides a detailed 3D view of the calcium and plaque buildup to help the surgeon select the correct stent size.
Electrocardiogram (EKG): To ensure the heart is stable, as manipulating the carotid artery can sometimes affect heart rate.
Blood Panels: Routine screens to check kidney function (for processing contrast dye) and blood clotting levels.
Life After Carotid Artery Stenting
Hospital Stay: Typically 24 hours for close monitoring of blood pressure and neurological status.
Immediate Recovery: Patients must remain on bed rest for about 6 hours post-op to ensure the access site in the groin or wrist heals without bleeding.
Medication Adherence: This is the most critical step; missing blood thinners in the first 3 to 6 months can cause the stent to clog (stent thrombosis). Lifetime aspirin is usually required.
Activity: Heavy lifting and strenuous exercise are restricted for 1 week, though most patients return to normal light activities within a few days.
Follow-up Schedule: Ultrasound scans are mandatory at 1 month, 6 months, and then annually to ensure the artery remains open.
Benefits of Carotid Artery Stenting
Minimally Invasive: Avoids a large incision in the neck, reducing the risk of local nerve damage and scarring.
Faster Recovery: Most patients return to their normal routine much sooner than those undergoing open surgery.
Real-time Monitoring: Since it is usually performed under local anesthesia, the medical team can communicate with the patient throughout the procedure to ensure brain function remains perfect.
Effective Stroke Prevention: Long-term studies show that CAS is highly effective at keeping the carotid artery open and preventing future strokes.