TCAR, or transcarotid artery revascularization, is a minimally invasive procedure that opens a narrowed carotid artery in the neck to reduce the risk of stroke. It combines elements of traditional open surgery and catheter-based stenting, using a unique system that temporarily reverses blood flow away from the brain to prevent debris from reaching it during the procedure. The entire process takes about an hour and a half and requires only a small incision just above the collarbone.
Why TCAR Exists
The carotid arteries run along each side of your neck and supply blood to your brain. When fatty plaque builds up inside one of these arteries (a condition called carotid stenosis), pieces of that plaque can break off and travel to the brain, causing a stroke. Two older procedures have long been used to treat this narrowing: carotid endarterectomy (CEA), an open surgery where a surgeon physically removes the plaque, and transfemoral carotid artery stenting (TF-CAS), where a catheter is threaded up from the groin through the aorta to place a mesh tube (stent) in the artery.
Both approaches have drawbacks for certain patients. Open surgery requires general anesthesia and a larger incision, which can be risky for people with serious heart or lung conditions. The groin-based stenting approach requires navigating a catheter through the aortic arch, which is dangerous when the arch is heavily calcified, unusually shaped, or when the arteries leading to the carotid are tortuous. TCAR was developed specifically for patients who face elevated risk from either of these alternatives.
How Flow Reversal Protects the Brain
The defining feature of TCAR is its neuroprotection system. During any procedure on a carotid artery, there’s a risk that tiny fragments of plaque will break loose and travel toward the brain, potentially causing a stroke. TCAR addresses this by temporarily reversing the direction of blood flow in the carotid artery so that any dislodged particles move away from the brain instead of toward it.
Here’s how it works in practice. The surgeon makes a small cut, about 1 to 1.5 inches, in your neck just above the collarbone and places a short tube called a sheath directly into the common carotid artery. This sheath connects to an external circuit that routes blood out of the carotid, through a filter that captures any debris, and returns the filtered blood to your body through a tube placed in a vein in your upper leg. While this reversed flow is active, the surgeon advances a stent through the sheath and deploys it at the site of the blockage, propping the artery open. Once the stent is in place, normal blood flow is restored and the external circuit is removed.
Because the surgeon accesses the carotid artery directly through the neck rather than navigating up from the groin, the catheter never passes through the aortic arch. This eliminates one of the most common sources of stroke risk during traditional stenting procedures.
Who Is a Candidate
TCAR is generally reserved for patients considered high risk for traditional open surgery. That includes people with significant heart disease, severe lung conditions, or previous neck surgery or radiation that makes a standard endarterectomy more dangerous. It’s also an option when the anatomy of the aortic arch or the arteries leading to it makes a groin-based approach hazardous, such as patients with a type III aortic arch, severe aortic arch calcification, or twisting in the internal carotid artery that would prevent safe placement of an embolic filter from below.
Not everyone qualifies for TCAR based on anatomy alone. The internal carotid artery needs to be between 4 and 9 millimeters in diameter, and there must be enough distance (more than 5 centimeters) between the collarbone and the point where the carotid artery branches. The common carotid artery itself must be wider than 6 millimeters, and the area where the surgeon places the sheath should be relatively free of plaque. Patients with deeper necks, where the artery sits more than 4 centimeters below the skin surface, present a greater technical challenge for gaining access.
You also need to be able to tolerate blood-thinning medications like aspirin and clopidogrel, since these are essential after stent placement to prevent clots from forming on the new device. Patients with nickel allergies are excluded because the stent is made of nitinol, a nickel-titanium alloy.
How TCAR Compares to Other Options
A large comparative study published in 2022 looked at perioperative outcomes across all three procedures. The rate of stroke or death within the first 30 days was 2.0% for TCAR, 1.7% for traditional open surgery (CEA), and 3.7% for groin-based stenting (TF-CAS). So TCAR’s short-term safety falls between the other two approaches, with open surgery holding a slight edge in the immediate postoperative period.
At one year, however, the gap between TCAR and open surgery essentially disappeared. The one-year stroke or death rate was 6.4% for TCAR and 5.2% for CEA, a difference that was not statistically significant after adjusting for patient risk factors. Groin-based stenting had the highest one-year rate at 9.7%. For symptomatic patients specifically, those who had already experienced a stroke or mini-stroke, TCAR actually showed the lowest one-year likelihood of stroke or death compared to both alternatives.
Open surgery remains the gold standard for most patients with carotid stenosis. But for people who carry higher surgical risk, TCAR offers outcomes that are comparable at one year while avoiding the need for general anesthesia and a larger open operation.
What to Expect During the Procedure
TCAR is typically performed under local anesthesia with sedation rather than general anesthesia, which is one of its advantages for patients with heart or lung problems. You’ll be awake enough during certain parts of the procedure for the surgical team to monitor your neurological function, sometimes by asking you to squeeze a ball or answer simple questions. This real-time check helps the team confirm that your brain is tolerating the temporary flow reversal.
The procedure itself takes roughly an hour and a half. After the surgeon places the sheath in your carotid artery and activates the flow reversal system, the stent is delivered through the same access point and expanded at the narrowed segment. The stent is self-expanding, made of a flexible metal alloy that conforms to the artery wall. Once positioned, the flow reversal circuit is disconnected, the sheath is removed, and the small neck incision is closed.
Recovery After TCAR
Because the incision is small and the procedure avoids general anesthesia, recovery tends to be faster than with open carotid surgery. Most patients stay in the hospital for observation, typically overnight, so the medical team can monitor blood pressure and watch for any neurological changes in the first 24 hours. The neck incision is small enough that it generally heals with minimal scarring.
After discharge, you’ll be placed on antiplatelet medications to keep the stent from developing clots. Follow-up imaging, usually an ultrasound of the carotid artery, is scheduled in the weeks and months after the procedure to confirm the stent is staying open and the artery is healing properly. Most people return to light daily activities within a few days, though your care team will give specific guidance on when to resume driving, exercise, and other physical tasks.
Medicare and Insurance Coverage
Medicare covers carotid artery stenting with embolic protection, the category TCAR falls under, for patients who are high risk for open surgery. Coverage applies to symptomatic patients with 70% or greater carotid stenosis. Symptomatic patients with stenosis between 50% and 70%, and asymptomatic patients with stenosis of 80% or greater, can also be covered but often under the terms of approved clinical studies or post-approval registries.
Facilities performing TCAR must meet specific standards set by the Centers for Medicare and Medicaid Services. They need dedicated imaging equipment, appropriate device inventory, and a formal program for granting privileges to the surgeons performing the procedure. Hospitals are required to collect data on all carotid stenting cases and analyze outcomes at least every six months, with that data available to CMS on request. Private insurers generally follow similar criteria, though coverage specifics vary by plan.