How Stents Are Placed in the Heart and What to Expect

A coronary stent is placed through a thin, flexible tube threaded from an artery in your wrist or groin all the way to a blocked artery in the heart, where a tiny mesh scaffold is expanded against the vessel wall to hold it open. The whole procedure typically takes between 30 minutes and two hours, and most people go home the same day or the next morning. But the experience stretches well beyond what happens in the catheterization lab, from diagnostic tests beforehand to months of medication and lifestyle adjustment afterward. Understanding the full arc helps you walk into the procedure with realistic expectations and recover with fewer surprises.

Why a Stent Becomes Necessary

Heart arteries narrow when fatty, calcium-laden deposits build up along the vessel walls over years. These plaques vary widely in makeup and behavior. Some are stable, fibrous, and slow-growing; others are soft, inflamed, and prone to rupturing without warning.¹ When a plaque narrows the artery enough to choke off blood flow, the heart muscle downstream gets starved of oxygen. That oxygen shortfall is what causes chest pain during exertion (stable angina), and when a plaque ruptures and a clot forms suddenly, it can trigger a heart attack.

A stent addresses the mechanical problem: it physically props the artery open so blood flows freely again. Medications and lifestyle changes tackle the underlying disease, but they can’t always reopen a severely blocked vessel on their own. In emergencies, getting a stent in quickly can be lifesaving. In planned (elective) cases, it’s done to relieve symptoms that haven’t responded adequately to medication alone.

What Happens Before the Procedure

The journey usually starts with a stress test or imaging study that suggests a significant blockage. From there, your cardiologist orders a coronary angiogram, an X-ray-based procedure where contrast dye is injected into the heart’s arteries to reveal exactly where and how severely they’re narrowed. In some cases, the angiogram and stent placement happen in the same session: the doctor sees the blockage in real time and treats it right then. In others, the diagnostic step comes first and the intervention is scheduled separately.

Patients with additional conditions like diabetes, kidney disease, or high blood pressure need extra attention during planning. A case report involving a patient on dialysis with multiple risk factors illustrates why: calcified blockages and fragile kidneys require careful contrast-dye management and sometimes advanced imaging to guide stent placement precisely.² Before any stent procedure, you’ll be asked about medications you take (blood thinners and diabetes drugs may need adjusting), allergies to contrast dye or latex, and kidney function. Blood tests and an ECG are standard.

Where the Catheter Goes In

The two entry points for a catheter are the radial artery at the wrist and the femoral artery in the groin. Over the past decade, the wrist has become the preferred route in most hospitals, and the data explain why. A large meta-analysis pooling individual patient data from seven multicenter randomized trials found that wrist access cut the risk of major bleeding roughly in half compared with groin access, and was linked to a 24% relative reduction in death.³ Another systematic review confirmed a significant drop in major bleeding, death, and vascular complications with the wrist approach.⁴

The tradeoff is that procedures through the wrist sometimes take a bit longer and expose both you and the operator to slightly more radiation, because the catheter has a longer, more winding path to travel.⁵ Still, wrist access means you can sit up and walk around sooner afterward, since there’s no large groin wound that needs hours of bed rest and pressure. In certain complex cases or when the wrist artery is too small, the groin remains the fallback.

Inside the Cath Lab

You’ll lie on a narrow table in a room that looks like a high-tech operating suite, with large screens overhead showing live X-ray images of your heart. You’re awake the entire time but sedated enough to feel calm and drowsy. The access site gets numbed with local anesthetic, so you feel pressure but not pain when the catheter is introduced.

The cardiologist threads a guide wire through the catheter and navigates it, under fluoroscopy, up through the aorta and into the coronary artery that’s blocked. Contrast dye injected at key moments lights up the vessel on screen, showing exactly where the narrowing is. Once the wire crosses the blockage, a balloon-tipped catheter carrying the collapsed stent is advanced to that spot. The balloon is inflated, which expands the stent against the artery wall and compresses the plaque. After a few seconds, the balloon is deflated and withdrawn, leaving the stent permanently in place. More dye is injected to confirm that blood flow has been restored.

In some labs, intravascular imaging tools go a step further. Ultrasound probes or light-based scanners threaded inside the artery give a cross-sectional view of the vessel wall, helping the operator confirm that the stent is fully expanded and well-seated. These tools are especially useful in patients with diabetes or kidney disease, where plaque tends to be more complex and getting the stent positioned perfectly matters even more.⁶ The imaging adds a few minutes but can catch problems like incomplete expansion or edge dissections that might not be visible on a standard angiogram.⁷

Drug-Eluting Versus Bare-Metal Stents

Early balloon angioplasty, performed without a stent, was plagued by unpredictable results: arteries would recoil shut or the lining would tear, and re-narrowing (restenosis) was common. The first bare-metal stents solved the recoil problem but introduced their own issue, a tissue-overgrowth response that gradually re-blocked the stent from the inside.⁸ Drug-eluting stents addressed this by coating the metal mesh with medication that suppresses that overgrowth. Their introduction allowed stenting to be used safely in more complex disease patterns, and they’re now the default choice in most settings.

A large trial comparing the two types found that at six years, rates of death and heart attack were essentially the same, but repeat procedures were needed less often with drug-eluting stents (about 16.5% versus nearly 20%), and stent clotting was slightly less common.⁹ Those differences matter over years, especially if you’d rather avoid going through another procedure.

Bioresorbable Stents and the Search for Something Better

A stent that does its job and then dissolves sounds ideal. That’s the idea behind bioresorbable stents, which are made of materials that the body gradually absorbs over a couple of years, theoretically leaving behind a healed, stent-free artery. In practice, the technology hasn’t lived up to the promise yet. A meta-analysis of randomized trials at five years found that while bioresorbable stents matched conventional metal stents on cardiac death, they performed worse on several other measures, including higher rates of stent clotting and a greater need for repeat procedures.¹⁰ An earlier meta-analysis of over 5,700 patients also flagged a significant increase in heart attacks with the bioresorbable devices.¹¹ Research continues with thinner-strut designs and different materials, but for now, metal drug-eluting stents remain the standard.

Emergency Versus Planned Stenting

There’s a meaningful difference in what to expect depending on whether the procedure is scheduled or done urgently during a heart attack. In a registry study comparing emergent and elective stent placement in a particularly high-risk location (the left main coronary artery), the elective group had a 100% procedural success rate compared with 88% in the emergency group, and in-hospital mortality was dramatically lower: about 2% for planned cases versus 24% for emergencies.¹² That gap reflects the reality that emergency patients are sicker, often in shock, and the procedure is being done to stop an active crisis rather than to prevent one.

If you’re having a planned procedure, you’ll have time to discuss options, prepare mentally, and arrive at the hospital with instructions. If you arrive with a heart attack, everything happens fast. You’ll be rushed to the cath lab, and the team’s priority is opening the blocked artery as quickly as possible. In either scenario, the mechanical steps are essentially the same, but the urgency, risk level, and your experience of the event are very different.

What Medications Follow

After a stent is placed, you’ll be started on dual antiplatelet therapy, a combination of aspirin and a second blood-thinning drug (commonly clopidogrel, ticagrelor, or prasugrel). The purpose is to prevent blood clots from forming on the new stent while the artery lining heals over it. How long you stay on both drugs is one of the more actively debated questions in cardiology.

A meta-analysis of randomized trials found that shorter courses (less than 12 months) reduced bleeding without a clear increase in clotting events, making abbreviated therapy reasonable for most patients. For people with a very high risk of future heart events and a low bleeding risk, extending therapy beyond 12 months showed some benefit, though it also raised the rate of death from all causes for reasons researchers are still investigating.¹³ A separate observational study from the Veterans Administration found that patients who took clopidogrel beyond 12 months had a lower risk of death and heart attack compared to those who stopped earlier, and the benefit was more pronounced among people with drug-eluting stents.¹⁴

In practice, your cardiologist tailors the duration to your individual bleeding and clotting risk. The key takeaway: don’t stop these medications on your own. Premature discontinuation is one of the biggest risk factors for stent clotting, which can cause a sudden heart attack.

Possible Complications

Stenting is one of the most commonly performed heart procedures worldwide, and serious complications are uncommon, but they do happen. At the access site, bleeding and bruising are the most frequent issues, particularly with groin access. More concerning is kidney injury caused by the contrast dye used during the procedure. A pooled analysis of patients with acute coronary syndromes found that contrast-induced kidney injury was linked to higher rates of both short-term and long-term adverse events, including major bleeding.¹⁵ Older age, pre-existing kidney problems, diabetes, low blood pressure during the procedure, and a weak heart all raise the risk of kidney injury afterward.¹⁶

Over the longer term, the main worry is restenosis: the artery gradually re-narrowing inside the stent due to tissue overgrowth. Drug-eluting stents have drastically reduced this problem compared to bare-metal ones, but it still occurs in a meaningful minority of patients, sometimes requiring a repeat procedure.¹⁷ Stent thrombosis, where a clot suddenly blocks the stent, is rarer but more dangerous and is the primary reason antiplatelet medications are so important.

Recovery and Cardiac Rehabilitation

Most people feel back to normal within a week or two after an uncomplicated stent placement. If the catheter went in through the wrist, the access-site soreness typically resolves in a few days. If through the groin, you may need to limit heavy lifting and strenuous activity for a bit longer while the puncture heals. You’ll have a follow-up visit within a few weeks, and your cardiologist will let you know when it’s safe to resume driving, exercise, and work.

Cardiac rehabilitation programs, which combine supervised exercise with education on diet, medication, and stress management, are strongly recommended afterward. A community-based study found that cardiac rehab participation after stenting was associated with a significant reduction in death.¹⁸ There’s also evidence that exercise-based rehab directly affects what’s happening inside the stent. One study found that patients who completed a cardiac rehab program had about 35% less tissue overgrowth inside their stents at nine months compared to patients who didn’t participate.¹⁹ Another study confirmed that rehab reduced in-stent re-narrowing consistently across different generations of drug-eluting stents.²⁰ Despite the evidence, rehab remains underutilized. If you’re offered a spot in a program, it’s worth taking.

When Bypass Surgery Is the Better Option

Stenting isn’t always the right choice. When multiple arteries are blocked or when the main trunk of the left coronary artery is diseased, bypass surgery (CABG) competes with stenting, and often wins on long-term outcomes. A meta-analysis of individual patient data found that bypass surgery led to fewer heart attacks and fewer repeat procedures compared with drug-eluting stents for people with multivessel disease, though death and stroke rates were similar between the two approaches.²¹ A large pooled analysis also showed that while stenting had a lower 30-day risk of death and stroke, long-term mortality favored bypass surgery, with the survival advantage particularly strong among patients with diabetes.²²

The picture is more nuanced for left main disease alone, where some data suggest outcomes are comparable between stenting and surgery.²¹ The decision often comes down to the anatomy of your blockages, how many vessels are involved, whether you have diabetes, and your overall health. A heart team discussion, where a cardiologist and a cardiac surgeon review the case together, is increasingly standard for complex disease.

How Outcomes Differ for Women

Women undergoing stenting face a somewhat different risk profile than men. A large national registry study found that women had higher rates of in-hospital complications, including roughly 86% higher odds of bleeding and 41% higher odds of death during the hospital stay.²³ The likely culprits include smaller artery size, older average age at the time of the procedure, and more coexisting conditions like diabetes and hypertension.

Interestingly, the story flips over the longer term. That same study found that women actually had a slightly lower adjusted risk of death at about 20 months compared to men. A separate analysis of over 6,000 pooled trial patients confirmed a similar pattern: women had higher unadjusted rates of adverse events at five years, but when researchers accounted for vessel size and comorbidities, female sex was no longer an independent predictor of death.²⁴ Women did, however, have a higher rate of needing repeat procedures, possibly related to their smaller vessels. The practical message: if you’re a woman heading into stenting, expect the procedure to go well, but know that your care team should be especially attentive to bleeding risk and access-site management.

The Emotional Side of Stenting

Getting a stent placed can be psychologically jarring, even when it goes smoothly. Anxiety is extremely common before and immediately after the procedure, and research shows that patients who are anxious beforehand tend to remain anxious at later follow-ups as well.²⁵ Depression, anxiety, and a diminished sense of quality of life are recognized factors that affect both how coronary artery disease develops and how well people recover from heart procedures.²⁶ One study found that the procedure itself can temporarily worsen anxiety and depression, but that targeted psychological support reduced those negative emotions.²⁷

If you find yourself feeling on edge, tearful, or unusually worried in the weeks after your procedure, that response is normal and treatable. Ask your care team about counseling or support resources. This is especially important if you experienced a heart attack before the stent, as the suddenness of a cardiac event can leave a lasting mark even after the physical problem has been fixed.

Robotic-Assisted Stenting

A newer development is robot-assisted stent placement, where the cardiologist controls the catheter from a shielded console rather than standing next to the patient at the table. The technology aims to improve precision. In one comparison, the rate of suboptimal stent sizing dropped dramatically with robotic assistance, from about 43% with conventional technique to roughly 2%, because the system makes sub-millimeter measurements of the artery rather than relying on the operator’s visual estimate.²⁸ That accuracy also means fewer extra stents are needed during the case, which cuts cost and reduces the amount of metal sitting inside the artery. Robotic assistance additionally lowers radiation exposure for the operator and, in some setups, for the patient as well.²⁹ The technology is still limited to a small number of centers, but it represents one of the more tangible ways engineering is pushing the procedure forward.