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February 7, 2012

Coronary Balloon Angioplasty and Stents
(Percutaneous Coronary Intervention, PCI)

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What is balloon angioplasty?

Balloon angioplasty of the coronary artery, or percutaneous transluminal coronary angioplasty (PTCA), was introduced in the late 1970's. PTCA is a non-surgical procedure that relieves narrowing and obstruction of the arteries to the muscle of the heart (coronary arteries). This allows more blood and oxygen to be delivered to the heart muscle. PTCA, is now referred to as percutaneous coronary intervention, or PCI, as this term includes the use of balloons, stents, and atherectomy devices. Percutaneous coronary intervention is accomplished with a small balloon catheter inserted into an artery in the groin or arm, and advanced to the narrowing in the coronary artery. The balloon is then inflated to enlarge the narrowing in the artery. When successful, percutaneous coronary intervention can relieve chest pain of angina, improve the prognosis of individuals with unstable angina, and minimize or stop a heart attack without having the patient undergo open heart coronary artery bypass graft (CABG) surgery.

Coronary Balloon Angioplasty Illustration

In addition to the use of simple balloon angioplasty, the availability of stainless steel stents, in a wire-mesh design, have expanded the spectrum of people suitable for percutaneous coronary intervention, as well as enhanced the safety and long-term results of the procedure. Since the early 1990's, more and more patients are treated with stents, which are delivered with a percutaneous coronary intervention balloon, but remain in the artery as a "scaffold". This procedure has markedly reduced the numbers of patients needing emergency CABG to below 1%, and particularly with the use of the new "medicated" stents (stents coated with medications that help prevent plaque formation), has reduced the rate of recurrence of the blockage in the coronary artery ("restenosis") to well below 10%. At present, the only patients treated with just balloon angioplasty are those with vessels less than 2mm (the smallest diameter stent), certain types of lesions involving branches of coronary arteries, those with scar tissue in old stents, or those who cannot take the blood thinner medication known as clopidogrel bisulfate (Plavix), which is taken over the long-term following the procedure.

Various "atherectomy" (plaque removal) devices were initially developed as adjuncts to percutaneous coronary intervention. These include the use of the excimer laser for photoablation of plaque, rotational atherectomy (use of a high-speed diamond-encrusted drill) for mechanical ablation of plaque, and directional atherectomy for cutting and removal of plaque. Such devices were initially thought to decrease the incidence of restenosis, but in clinical trials were shown to be of little additional benefit, and now are only used in selective cases as an adjunct to standard percutaneous coronary intervention (percutaneous artery intervention).




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Symptom Checker: Your Guide to Symptoms & Signs: Pinpoint Your Pain



Angioplasty and Stents

Introduction to angina

Chest pain is a common symptom that is caused by many different conditions. Some causes require prompt medical attention, such as angina, heart attack, or tearing of the aorta. Other causes of chest pain that may not require immediate medical intervention include spasm of the esophagus, gallbladder attack, or inflammation of the chest wall. An accurate diagnosis is important in providing proper treatment to patients with chest pain.

The diagnosis and treatment of angina is discussed below, as well as the diagnosis of other causes of chest pain that can mimic angina.

What is angina, and what are the symptoms of angina?

Angina (angina pectoris - Latin for squeezing of the chest) is chest discomfort that occurs when there is a decreased blood oxygen supply to an area of the heart muscle. In most cases, the lack of blood supply is due to a narrowing of the coronary arteries as a result of arterioscler...

Read the Angina article »







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