A stent procedure is a minimally invasive treatment that opens a blocked or narrowed artery by placing a small mesh tube inside it. The tube, called a stent, acts as scaffolding to hold the artery open and restore blood flow. Most stent procedures target the coronary arteries that supply blood to the heart, though stents are also placed in arteries in the neck, legs, and kidneys. The procedure typically takes one to two hours, and most people go home the next day.
Why a Stent Is Needed
Arteries can become narrowed or blocked over time as fatty deposits build up along their walls. When this happens in the coronary arteries, the heart muscle receives less blood and oxygen than it needs. That shortage can cause chest pain (angina), shortness of breath, or, if a blockage becomes severe or sudden, a heart attack.
A stent procedure is typically recommended when lifestyle changes and medications haven’t adequately improved symptoms, when chest pain from blocked arteries is getting worse, or when blood flow to the heart needs to be restored quickly during a heart attack. In some cases, doctors discover the blockage during a diagnostic imaging procedure and place the stent in the same session.
How the Procedure Works
The procedure begins with a small puncture in an artery, usually at the wrist or the groin. Through that puncture, your doctor inserts a thin, flexible tube called a catheter. Using real-time X-ray imaging and a contrast dye that makes blood vessels visible on screen, the catheter is guided through the arterial system until it reaches the blocked section of the artery.
Once the blockage is located, a fine guidewire is threaded through the catheter and positioned past the narrowed area. A second catheter carrying a deflated balloon with the stent wrapped around it is then slid over that wire and positioned precisely at the blockage. When the balloon is inflated, it expands the stent against the artery wall, compressing the fatty deposits and widening the passage. The balloon is then deflated and removed, leaving the stent permanently in place. Final images confirm the stent is correctly positioned and blood is flowing freely.
You’re awake for the procedure under local anesthesia and mild sedation. You may feel pressure at the catheter insertion site, but the procedure itself is not painful.
Types of Stents
There are two main categories: bare-metal stents and drug-eluting stents. Bare-metal stents are simple mesh tubes with no coating. They work, but they carry a notable downside: 20 to 30 percent of patients develop re-narrowing at the stent site within six months, because the body’s healing response can cause tissue to grow through the mesh and partially block the artery again.
Drug-eluting stents solve this problem by releasing a medication from a thin polymer coating that slows that tissue growth. With modern drug-eluting stents, re-narrowing rates drop to under 10 percent. Current guidelines from the American College of Cardiology and the American Heart Association recommend second-generation drug-eluting stents as the standard of care for nearly all patients.
Stent materials have also improved significantly. Early stents were made from stainless steel, which required thick, bulky struts to maintain strength. Newer alloys like cobalt-chromium and platinum-chromium are inherently stronger, so manufacturers can make the struts thinner (under 100 micrometers versus over 100 for steel). Thinner struts mean the stent is more flexible, easier to navigate through winding arteries, and less likely to cause blood clots at the site.
Stents Beyond the Heart
While coronary stents are the most common, the same basic technique applies to other arteries. Carotid stents open blocked arteries in the neck that supply blood to the brain, reducing stroke risk. Peripheral artery stents treat narrowed vessels in the legs, improving circulation and relieving pain during walking. Renal artery stents restore blood flow to the kidneys. Each location carries its own risk profile. Carotid stenting, for example, requires especially careful patient selection because of the potential for neurological complications during the procedure.
How to Prepare
Your medical team will review your full medication list and health history before scheduling the procedure. In general, you’ll be asked to fast for eight hours beforehand, with water being the exception. If you take blood thinners, your doctor will likely adjust your dosage or timing in the days leading up to the procedure. You should also mention any allergies, particularly to contrast dye or metals, since both are used during stenting.
Risks and Complications
Stent procedures have a high success rate, but they carry some risk. The most common issues include bruising or bleeding at the catheter insertion site, which usually resolves on its own. Less common but more serious complications include blood clot formation on the stent (stent thrombosis), damage to the artery during the procedure, an allergic reaction to the contrast dye, or kidney stress from processing the dye. Re-narrowing of the stented artery remains possible even with drug-eluting stents, though at much lower rates than in earlier generations. If it does occur, it typically develops within the first six to twelve months and may require a repeat procedure.
Recovery and Getting Back to Normal
For a planned, non-emergency stent procedure, recovery is relatively quick. Most people stay in the hospital overnight for monitoring and go home the following day. You’ll need to keep the insertion site clean and watch for signs of infection or unusual bleeding.
Expect to avoid heavy lifting and strenuous physical activity for about a week while the puncture wound heals. Driving is off-limits for a week as well. If the procedure was planned and went smoothly, most people return to work within a week. Recovery after an emergency stent placed during a heart attack takes considerably longer, potentially several weeks to months, because the heart itself needs time to heal from the damage.
Medications After a Stent
The most important part of post-stent care is taking blood-thinning medications exactly as prescribed. After a stent is placed, the body recognizes it as a foreign object, and blood clots can form on the metal surface before the artery wall has a chance to heal over it. To prevent this, you’ll be placed on two anti-clotting medications taken together, a regimen called dual antiplatelet therapy.
Current European and American guidelines recommend six months of this dual therapy for patients who received a stent for stable coronary disease. If the stent was placed during or after a heart attack, the recommended duration extends to twelve months. Your cardiologist may shorten or lengthen this window based on your individual bleeding risk and other health factors. Stopping these medications early without medical guidance is one of the most dangerous things you can do after a stent, because it significantly raises the chance of a clot forming inside the stent.
Beyond medication, long-term success depends on the same lifestyle factors that prevent heart disease in general: regular physical activity once you’re cleared, a heart-healthy diet, not smoking, and managing blood pressure and cholesterol. A stent fixes the immediate blockage, but it doesn’t stop the underlying process that caused plaque to build up in the first place.