angioplasty

angioplasty
Name	Angioplasty
Caption	A diagrammatic representation of the procedure
MeshID	D000017
MedlinePlus	007473

angioplasty. It is a minimally invasive endovascular procedure used to widen narrowed or obstructed arteries or veins, typically to treat atherosclerotic disease. The most common form involves threading a catheter to the site of blockage and inflating a small balloon to compress the plaque against the arterial wall. This procedure is often combined with the permanent placement of a small wire mesh tube called a stent to help keep the vessel open and improve blood flow.

Procedure

The procedure is typically performed in a cardiac catheterization laboratory by an interventional cardiologist or vascular surgeon. Under local anesthesia, access is gained via a major peripheral artery, most commonly the femoral artery in the groin or the radial artery in the wrist. Using fluoroscopic guidance from an X-ray machine, a guidewire is advanced through the aorta to the site of the coronary artery blockage. A deflated balloon catheter is then passed over the guidewire to the narrowed segment. Upon inflation, the balloon compresses the atherosclerotic plaque against the vessel wall, restoring lumen diameter. In most contemporary procedures, a drug-eluting stent or bare-metal stent is deployed at the site to provide structural support and reduce the risk of restenosis. The success of the intervention is immediately assessed using contrast angiography to visualize blood flow through the treated segment.

Indications

The primary indication is the treatment of symptomatic coronary artery disease, such as stable angina or acute coronary syndromes including unstable angina and myocardial infarction, particularly ST-elevation myocardial infarction where it is a cornerstone of percutaneous coronary intervention. It is also indicated for critical limb ischemia caused by peripheral artery disease affecting vessels like the iliac artery or superficial femoral artery. Furthermore, it is used to treat renal artery stenosis to manage refractory hypertension and salvage kidney function, as well as carotid artery stenosis to prevent ischemic stroke. The decision to proceed is based on clinical assessment and imaging studies like coronary angiography or computed tomography angiography, often following stress tests conducted at institutions like the Cleveland Clinic or Mayo Clinic.

Risks and complications

While generally safe, the procedure carries several potential risks. These include bleeding or hematoma at the access site, damage to the blood vessel, and allergic reactions to the contrast dye. More serious complications include coronary artery dissection, abrupt vessel closure, and the risk of stent thrombosis. Distal embolization of plaque debris can cause myocardial infarction or stroke. Contrast-induced nephropathy is a concern for patients with pre-existing renal impairment. There is also a long-term risk of in-stent restenosis, where the treated artery narrows again due to tissue growth, a problem mitigated by the development of drug-eluting stents by companies like Boston Scientific and Medtronic. The overall risk profile is influenced by patient comorbidities and the complexity of the lesion, as classified by the American College of Cardiology.

Recovery and aftercare

Post-procedure, patients are monitored for several hours, often in a dedicated recovery unit. Discharge typically occurs within 24 to 48 hours for uncomplicated cases. Critical aftercare involves dual antiplatelet therapy, usually with aspirin and a P2Y12 inhibitor like clopidogrel or ticagrelor, to prevent stent thrombosis, as recommended by guidelines from the American Heart Association. Patients are advised to avoid strenuous activity for a short period and to manage cardiovascular risk factors through lifestyle modifications, including smoking cessation and dietary changes. Follow-up stress testing may be scheduled, and participation in cardiac rehabilitation programs is strongly encouraged to improve overall cardiovascular health and functional capacity.

History and development

The foundational work for balloon angioplasty was performed by German physician Charles Dotter at the University of Oregon in 1964, who first described catheter-based dilatation for peripheral arteries. The technique for coronary arteries was pioneered by Swiss cardiologist Andreas Gruentzig, who performed the first successful human coronary balloon angioplasty in Zurich in 1977. This groundbreaking event was a major advancement over the then-dominant coronary artery bypass graft surgery. Subsequent decades saw rapid technological evolution, including the introduction of the first coronary stent by Jacques Puel in Toulouse in 1986. The development of drug-eluting stents, such as the Cypher stent from Cordis Corporation, marked another revolution by significantly reducing rates of restenosis. Ongoing research continues to explore bioresorbable scaffolds and improved antiplatelet regimens.

Alternatives

The main alternative for treating significant coronary blockages is coronary artery bypass graft surgery, a major open-heart procedure performed by cardiothoracic surgeons that uses grafts from the internal thoracic artery or saphenous vein. For patients with stable coronary disease, optimal medical therapy with medications like statins, beta-blockers, and nitrates may be sufficient. Other less invasive interventional options include atherectomy devices to remove plaque, or laser angioplasty. For peripheral artery disease, alternatives include surgical bypass, endarterectomy, or supervised exercise therapy. The choice between these modalities is made by a heart team based on the patient's specific anatomy, as defined by the SYNTAX trial, and overall clinical condition.

Category:Medical procedures Category:Interventional radiology Category:Cardiology