Stent surgery is a minimally invasive procedure where a small wire mesh tube is permanently placed inside a narrowed or blocked artery to hold it open and restore blood flow. The most common version targets the coronary arteries of the heart, but stents are also used in leg arteries, neck arteries, kidney arteries, and other blood vessels throughout the body. The procedure typically takes about an hour and most people go home the same day or the next morning.
Why Stents Are Placed
The primary reason for a coronary stent is atherosclerosis, the buildup of fatty plaque inside artery walls that narrows the channel blood flows through. When a coronary artery narrows enough, the heart muscle downstream doesn’t get adequate oxygen. That can cause chest pain during exertion, shortness of breath, or, in the case of a heart attack, sudden and complete blockage of the artery.
The clearest benefit of stenting is during a heart attack. When someone is having the type of heart attack caused by a fully blocked artery (called a STEMI), opening that artery with a stent has a direct survival benefit. For every 16 patients treated this way instead of with clot-dissolving drugs alone, one additional death, repeat heart attack, or stroke is prevented. For less severe heart attacks (NSTEMI), stenting still offers a meaningful, though more modest, improvement in outcomes, particularly for higher-risk patients.
For people with stable chest pain who aren’t having a heart attack, the picture is different. In that setting, stenting is primarily done to relieve symptoms and improve quality of life rather than to extend survival. Modern medications for blood pressure, cholesterol, and blood clotting are effective enough that stenting on top of those drugs shows little additional survival benefit for most stable patients. The exception is when a large portion of the heart muscle, roughly more than 10%, is starved of blood flow. In that scenario, opening the artery does appear to reduce the risk of death.
How the Procedure Works
Stent placement is done through a procedure called percutaneous coronary intervention, or PCI. Rather than open-chest surgery, the entire operation happens through a small puncture in an artery, usually at the wrist or the groin. Here’s the general sequence:
After numbing the access site, the cardiologist inserts a thin, flexible tube called a catheter into the artery and threads it through the blood vessels up to the heart. X-ray imaging and a contrast dye injected through the catheter create a live picture of the coronary arteries, revealing exactly where the blockage is and how severe it looks. The cardiologist then passes a thin guidewire through the catheter and positions it just past the narrowed section.
A second catheter carrying the stent rides over that guidewire to the blockage site. The stent sits crimped around a tiny balloon at the catheter’s tip. Once it’s in the right spot, the balloon inflates, expanding the stent outward against the artery wall. The stent locks into its expanded shape, compressing the plaque and propping the artery open. The balloon deflates, the catheter is withdrawn, and a final set of images confirms the stent is properly positioned and blood is flowing freely.
Drug-Eluting vs. Bare-Metal Stents
Early stents were simply metal scaffolds, now called bare-metal stents. They solved the immediate problem of keeping an artery open, but the body sometimes responded by growing excess tissue inside the stent, gradually re-narrowing the artery. This process, called restenosis, was a significant limitation.
Drug-eluting stents addressed this by coating the metal mesh with a polymer that slowly releases a medication designed to prevent that tissue overgrowth. In large trials comparing the two, drug-eluting stents reduced the rate of repeat procedures from about 13% to about 9%. That roughly 40% relative reduction in the need for a second intervention made drug-eluting stents the standard choice for most patients today. Bare-metal stents are still occasionally used in specific situations, such as when a patient can’t tolerate the longer course of blood-thinning medication that drug-eluting stents require.
Stents Beyond the Heart
While coronary stents get the most attention, the same basic technology is used throughout the vascular system. Peripheral artery disease, where plaque builds up in the arteries supplying the legs, is one of the most common non-cardiac applications. Stents can be placed in the iliac arteries near the pelvis, the femoral arteries in the thigh, and even the smaller tibial arteries below the knee. The goal is the same: restore blood flow to prevent pain during walking, non-healing wounds, or, in severe cases, amputation.
Stents are also placed in the carotid arteries in the neck to reduce stroke risk, and in the renal arteries supplying the kidneys to treat certain types of hard-to-control high blood pressure. Biliary stents keep bile ducts open in patients with blockages from gallstones or tumors. Ureteral stents maintain urine flow from the kidneys to the bladder. Each of these applications uses stents tailored to the size and anatomy of the specific vessel or duct.
Preparing for the Procedure
Your medical team will review your current medications in advance and tell you which ones to stop and which to take on the morning of the procedure with small sips of water. You’ll need to fast beforehand, typically from midnight the night before, with no gum, hard candy, or food of any kind allowed. Avoid alcohol for at least 24 hours before the procedure. On the day itself, skip lotions, deodorants, and creams after your pre-procedure shower, and leave contact lenses at home. Bring a written list of your medications, including vitamins and supplements, but not the actual bottles.
Recovery in the First Two Weeks
Most people leave the hospital the same day or spend one night. Expect to feel tired and weak for the first day or two at home. Short walks around the house are fine, but plan to rest frequently and stand up slowly to avoid dizziness.
Your specific restrictions depend on where the catheter was inserted. If the access point was your wrist, you’ll need to limit use of that wrist for one to two days, avoid strenuous activity for 24 hours, and skip things like mowing the lawn or riding a motorcycle for 48 hours. If the access point was your groin, the restrictions are more conservative: no lifting anything over 10 pounds for five to seven days, no vigorous sports for five days, and take stairs slowly. Most people return to their normal routine within a week.
Blood-Thinning Medication After Stenting
One of the most important parts of stent recovery is dual antiplatelet therapy, a combination of aspirin and a second blood-thinning medication. These drugs prevent blood clots from forming inside the new stent, which is the most dangerous short-term complication of stent placement.
For patients who received a drug-eluting stent for stable heart disease, the minimum recommended course of dual therapy is 6 months. For patients who had a stent placed during a heart attack, the recommended minimum is 12 months. After that initial period, your cardiologist may suggest continuing the second medication longer depending on your individual clot and bleeding risk. Aspirin, however, is typically continued indefinitely. Stopping blood thinners too early is one of the strongest risk factors for a clot forming inside the stent, so it’s critical not to discontinue them without your cardiologist’s guidance.
Risks and Long-Term Outcomes
Stent placement is generally safe, but it does carry risks. The two main concerns are restenosis (the artery gradually re-narrowing inside the stent) and stent thrombosis (a blood clot suddenly forming inside the stent). Restenosis typically develops over months and causes a gradual return of symptoms. Stent thrombosis is rarer but more dangerous, as it can trigger a heart attack. Early discontinuation of antiplatelet medication is the single biggest preventable risk factor for thrombosis.
Long-term data from a large single-center study tracking patients for up to 10 years found survival rates of 95% at one year, 91% at three years, and 86% at five years. However, close to 40% of patients experienced some form of cardiac event over the long term, most commonly the need for a repeat procedure on the same or a different artery. These numbers reflect the fact that a stent treats one specific blockage but doesn’t cure the underlying disease process. Plaque can continue to build up elsewhere in the coronary arteries if the conditions that caused it persist.
That’s why lifestyle changes after stenting matter as much as the procedure itself. A heart-healthy diet, regular physical activity, not smoking, and consistently taking prescribed medications for cholesterol and blood pressure are what keep both the stent and the rest of your arteries functioning well over the years ahead.