Heart stents are placed through a minimally invasive procedure called percutaneous coronary intervention (PCI), where a cardiologist threads a thin tube through a blood vessel in your wrist or groin, guides it to the blocked artery in your heart, and expands a small mesh tube to hold the artery open. The whole process typically takes one to two hours, and most people go home within a day or two.
Before the Procedure
In a non-emergency situation, you’ll fast for several hours beforehand. If you take blood thinners, your doctor may have you stop them temporarily to reduce bleeding risk during the procedure. You’ll also be screened for allergies to contrast dye, which is used during the process to make your arteries visible on X-ray.
Most stent placements are done under mild sedation, meaning you’re awake but relaxed. General anesthesia is reserved for more complex or prolonged interventional procedures. You’ll be able to breathe on your own and may feel pressure at certain points, but the sedation keeps you comfortable throughout.
How the Catheter Reaches Your Heart
The cardiologist starts by inserting a small hollow tube called a sheath into a blood vessel. The two main access points are the radial artery in your wrist or the femoral artery near the top of your thigh. Wrist access has become increasingly common because it allows for faster recovery and less bleeding at the insertion site, though both approaches are safe and effective. A large clinical trial comparing the two found no significant difference in hospital stay, with a median of about three days for each.
Through the sheath, the cardiologist advances a long, flexible catheter up through your blood vessels and into the coronary arteries that supply your heart. A contrast dye is then injected through the catheter. This dye shows up brightly on X-ray, giving the cardiologist a real-time map of your arteries and revealing exactly where the blockages are.
Opening the Artery and Placing the Stent
Once the blockage is identified, the cardiologist threads a second catheter with a tiny deflated balloon on its tip to the narrowed section of the artery. The balloon is inflated, compressing the plaque against the artery walls and widening the passage. This part may cause brief chest pressure or discomfort, which is normal and passes quickly once the balloon deflates.
After the artery is widened, a stent (a small expandable mesh tube, usually made of metal) is positioned at the site of the blockage. The stent is mounted on another balloon catheter and expanded into place. Once deployed, it acts as a scaffold, holding the artery open permanently. The balloon is then deflated and withdrawn, leaving the stent behind. Over the following weeks, the artery’s inner lining gradually grows over the stent, incorporating it into the vessel wall.
How Doctors See What They’re Doing
The primary tool is fluoroscopy, a form of continuous X-ray that gives the cardiologist a live video feed of the catheter, guidewire, and stent as they move through the body. The contrast dye injected earlier makes the blood flow and artery walls visible in real time on a monitor.
For more complex cases, particularly blockages at the very opening of an artery or at a branch point, cardiologists may also use intravascular ultrasound (IVUS). This involves a tiny ultrasound probe on the tip of a catheter that provides detailed cross-sectional images from inside the artery itself. IVUS helps the doctor assess plaque buildup, measure the vessel’s size precisely, and confirm that the stent is fully expanded and correctly positioned after deployment. In some centers, IVUS-guided stent placement has become routine for tricky anatomies where fluoroscopy alone might not provide enough precision.
Drug-Eluting vs. Bare-Metal Stents
Nearly all stents placed today are drug-eluting stents (DES), which are coated with medication that slowly releases over time to prevent scar tissue from regrowing inside the stent. This regrowth, called restenosis, was a significant problem with older bare-metal stents. In clinical comparisons, about 13% of patients with bare-metal stents needed a repeat procedure on the same vessel, compared to roughly 9% with drug-eluting stents.
Bare-metal stents are still used in specific situations, mainly for people who have a high bleeding risk or who can’t reliably take blood-thinning medications for an extended period. The minimum recommended course of dual antiplatelet therapy (taking aspirin plus a second blood thinner together) is one month for bare-metal stents and six months for drug-eluting stents in stable heart disease. After a heart attack, guidelines recommend 12 months regardless of stent type.
Recovery and What to Expect After
If the catheter went through your wrist, you’ll have a compression band on your wrist for a few hours. If it went through your groin, you’ll need to lie flat for several hours to let the puncture site seal. Groin access more commonly requires a vascular closure device to help stop bleeding at the insertion point.
Most people return to normal physical activity and work within a few days to a week. Your doctor will give you specific guidance on when you can drive, lift heavy objects, or exercise based on which access site was used and how the procedure went. The wrist approach generally allows a quicker return to daily activities because there’s less restriction on leg movement.
The most important part of aftercare is medication. You’ll be prescribed dual antiplatelet therapy to prevent blood clots from forming on the new stent. Stopping these medications early is one of the biggest risk factors for a dangerous clot inside the stent, so sticking to the prescribed schedule is critical. You’ll also likely be on cholesterol-lowering medication and may need blood pressure drugs as part of long-term heart disease management.
How Safe Is the Procedure
Stent placement is one of the most commonly performed heart procedures worldwide, and serious complications are uncommon. In-hospital rates of major adverse cardiovascular events (heart attack, stroke, or death related to the procedure) run well below 1% in most studies. Bleeding at the catheter insertion site is the most frequent minor complication, and it’s usually manageable with pressure or a closure device.
Success rates vary depending on the complexity of the blockage. For routine blockages, procedural success rates are very high. Even for completely blocked arteries, which represent the most technically challenging cases, specialist operators achieve success rates above 90%. The key factor is the experience of the team performing the procedure, with dedicated high-volume operators consistently outperforming those who do fewer cases.