Heart Disease Treatment With Angioplasty and Stents
What Happens During Angioplasty?
First, a cardiac catheterization is performed as part of angioplasty. You will receive medication for relaxation, and then the doctor will numb the site where the catheter will be inserted with local anesthesia.
Next, a sheath (a thin plastic tube) is inserted into an artery -- sometimes in your groin, sometimes in the arm. A long, narrow, hollow tube, called a catheter, is passed through the sheath and guided up the blood vessel to the arteries surrounding the heart.
A small amount of contrast liquid is injected through the catheter and is photographed with an X-ray as it moves through the heart's chambers, valves, and major vessels. From the digital pictures of the contrast material, the doctors can tell whether the coronary arteries are narrowed and whether the heart valves are working correctly.
If the decision is made to perform angioplasty, the doctor will move the catheter into the artery with the blockage. He or she will then perform one of the interventional procedures described below.
The procedure usually lasts about 1 1/2 to 2 1/2 hours, but the preparation and recovery time add several hours. You may stay in the hospital overnight to be observed by the medical staff.
What Types of Interventional Procedures Are Used in Angioplasty?
There are several types of interventional procedures which your doctor may use when performing angioplasty. They include:
Balloon angioplasty. During this procedure, a specially designed catheter with a small balloon tip is guided to the point of narrowing in the artery. Once in place, the balloon is inflated to compress plaque against the artery wall and stretch the artery open to increase blood flow to the heart.
Stent. A stent is a small tube that acts as a scaffold to provide support inside your coronary artery. A balloon catheter, placed over a guide wire, is used to insert the stent into the narrowed coronary artery. Once in place, the balloon tip is inflated and the stent expands to the size of the artery and holds it open. The balloon is then deflated and removed while the stent stays in place. Over a several-week period, your artery heals around the stent. Stents are commonly placed during interventional procedures such as angioplasty to help keep the coronary artery open. The stent is usually made of metal and is permanent. It can also be made of a material that the body absorbs over time. Some stents contain medicine and are designed to reduce the risk of reblockage (restenosis). The doctor will determine if this type of stent is appropriate for your type of blockage.
Rotablation. A special catheter, with an acorn-shaped, diamond-coated tip, is guided to the point of narrowing in your coronary artery. The tip spins around at a high speed and grinds away the plaque on your artery walls. The microscopic particles are washed away in your blood stream and filtered out by your liver and spleen. This process is repeated as needed to allow for better blood flow. This procedure is rarely used today because balloon angioplasty and stenting have much better results and are technically easier for the cardiologist to perform.
Atherectomy. The catheter used in this procedure has a hollow cylinder on the tip with an open window on one side and a balloon on the other. When the catheter is inserted into the narrowed artery, the balloon is inflated, pushing the window against the plaque. A blade (cutter) within the cylinder rotates and shaves off any plaque that protruded into the window. The shavings are caught in a chamber within the catheter and removed. This process is repeated as needed to allow for better blood flow. Like rotablation, this procedure is rarely used today.
Cutting Balloon. The cutting balloon catheter has a special balloon tip with small blades. When the balloon is inflated, the blades are activated. The small blades score the plaque, then the balloon compresses the plaque against the artery wall.