Angioplasty opens a narrowed or blocked artery by inflating a tiny balloon inside it, pressing the buildup of fatty plaque against the artery wall and restoring blood flow. Most procedures also place a small mesh tube called a stent to keep the artery propped open afterward. The whole process is done through a thin, flexible tube threaded into your arteries, so there’s no open surgery involved. Success rates for opening the blocked artery exceed 95%.
Getting to the Blockage
The procedure starts with a small puncture in an artery, most commonly at your wrist (the radial artery). Wrist access has become the standard approach in most countries because it carries a lower risk of bleeding complications, is more comfortable, and lets you recover faster compared to the older method of going through the groin. For more complex blockages, your cardiologist may still use the femoral artery in the groin, which allows larger instruments.
Through that puncture point, your doctor feeds a long, thin tube called a catheter through your blood vessels all the way to the narrowed artery in your heart. To see where the catheter is going, the entire procedure is done under fluoroscopy, a type of real-time X-ray imaging. A contrast dye is injected through the catheter so the arteries show up clearly on a monitor, revealing exactly where and how severe the blockage is. Your doctor watches the screen throughout the procedure, using the live images to navigate and position instruments precisely.
How the Balloon Opens the Artery
Once the catheter reaches the blockage, a deflated balloon at its tip is positioned right inside the narrowed section. The balloon is then inflated, typically reaching pressures around 10 to 15 atmospheres. To put that in perspective, that’s roughly 10 to 15 times normal atmospheric pressure, enough force to physically compress the plaque flat against the artery wall.
The inflation stretches the artery open from a narrowed diameter back toward its normal size. In computational studies, balloons expanded a stenosis from about 4 mm to 10 mm in diameter. The key principle is mechanical: the balloon doesn’t remove plaque. It redistributes and compresses it, widening the channel so blood can flow freely again. Once the artery is open, the balloon is deflated and removed.
How a Stent Holds the Artery Open
In most angioplasty procedures, a stent is placed at the same time. The stent is a small wire mesh cylinder that sits collapsed around the balloon. When the balloon inflates, it pushes the stent outward against the artery wall. After the balloon is deflated and pulled out, the stent stays behind permanently, acting as scaffolding to prevent the artery from collapsing or narrowing again.
Modern stents are drug-eluting, meaning they’re coated with medication that slowly releases into the surrounding tissue. This coating prevents the artery wall from overgrowing scar tissue inside the stent, a problem called restenosis that was common with older bare-metal stents. The difference is significant: bare-metal stents had a re-narrowing rate of about 16%, while the best drug-eluting stents cut that to around 4%. A large analysis of over 117,000 patient-years of follow-up found that drug-eluting stents reduced the need for repeat procedures by 52% to 74% compared to bare-metal versions.
Angioplasty vs. Bypass Surgery
Not everyone with blocked arteries needs angioplasty. The decision depends on how many arteries are affected, where the blockages are, how well your heart is pumping, and whether you have other conditions like diabetes or kidney disease.
If only one artery is narrowed and symptoms are mild, medications and lifestyle changes are often tried first. Angioplasty becomes the better option when chest pain or shortness of breath hasn’t improved with those initial steps. If multiple arteries are blocked, or if a major artery feeding a large portion of the heart is involved, coronary bypass surgery is generally recommended instead. Bypass creates new routes around the blockages using blood vessels taken from elsewhere in your body, and it tends to produce better long-term results for complex, multi-vessel disease.
What Recovery Looks Like
Because angioplasty doesn’t involve cutting open your chest, recovery is fast. You’ll stay in the hospital for several hours to overnight for monitoring. Your doctor will likely ask you to limit physical activity for a couple of days after you get home. Most people can drive and return to work within about a week, though the exact timeline varies depending on the type of angioplasty and your overall health.
The puncture site at your wrist or groin may be sore or bruised for a few days, but it heals quickly. What takes more attention is the medication regimen that follows.
Medications After Stent Placement
After receiving a stent, you’ll need to take two blood-thinning medications together (sometimes called dual antiplatelet therapy) to prevent blood clots from forming on the new stent. Current guidelines recommend at least 6 months for people with stable heart disease and 12 months for those who had a heart attack or acute symptoms. If you’re at higher risk for bleeding, your doctor may shorten this to 1 to 3 months.
Recent research suggests that stopping the second blood thinner after about 9 months is associated with lower risks of both clotting events and bleeding complications. Eventually, most people transition to a single blood thinner that they continue long-term. Skipping or stopping these medications early without your cardiologist’s guidance can be dangerous, since a clot forming inside a stent can trigger a heart attack.