Hi,
To answer your question let me tell you the background of coronary blood supply and role of angiography and angioplasty. Our heart is supplied by four main coronary arteries - Right coronary artery (RCA), Left anterior descending artery (LAD), Left coronary artery (LCA) and Left circumflex artery (LCX). (see diagram)

In ccoronary angiography a dye is injected through one of the arteries of the leg or the arm and through special camera their passage through the coronary arteries is seen. Any narrowing or blockage is very clearly defined, as seen in your case. Once the coronary arteries get narrowed, the blood supply of the heart is hampered and can lead to angina or heart attack. Once the the narrowing or occluded coronary artery status is well established, the next step is either coronary Angioplasty or By-pass surgery depending on the number of atrteries involved and percentage of blockage. Patients with severe narrowing or blockage of the left main coronary artery or those with disease involving three or four coronary arteries are generally considered for bypass surgery. In patients with less than two vessel involvement, an angioplasty is preffered.

Angioplasty is not an open heart surgery. It is done similar to an angiography. A sleeve is inserted through the same artery which was used for the angiography. Through the sleeve a stent is introduced in the area of the blockage in the coronary artery opening it. The good part of angiography is that the patient is discharged after a day or two and can be in routine activity immediately.

It is not necessary that one has to have an angina or cardiac symptoms to undergo treatment. Infact you are lucky you have been daignosed before any angina or heart attack could occur. It is not necessary that a patient will have to undergo By-pass surgery after angioplasty. After angioplasty you will be put on lipid lowering medicines and be on regular follow up. If indicated an angiography can be repeated in the subsequent months or years depending on your condition. If required an angioplasty can be repeated or a by-pass done depending on number of coronary vessels involved. But most of the patients after angioplasty, if on regular medicines and maintain good blood cholesterol levels usually donot require any other intervention.

Read more here....

I would advise you to go ahead with the coronary angioplasty.

All the best!!

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regards
Dr. Gupta