Having four blocked arteries (one of which was 'Angioplasted' three weeks ago) I can understand the reason for the operation. The next day I feel so less tired than I had for years, which shows how these ailments creep up on you and gradually take you energy away. The only real side effect was a constant dizziness for a couple of weeks as (from what I understand) the heart goes from being starved of oxygen enriched blood to a state of oxygen overload and the body has to adjust. Now I have a new low cholesterol diet book which will hopefully reduce the other three blockages.