In 2006, I had CABG for blockages (2) in the main left coronary artery. However, the graft was unsuccessful for the blockage in the circumflex coronary artery. The cardiologist has told me I am not a candidate for angioplasty or a stent. He says it is because of the "anatomy of the vessel". He performed another heart cath 7 months after the CABG, and my heart went into "v-fib". In the last 4 months, I have begun to experience increase in shortness of breath and exercise-induced angina (stable). I take Plavix, Lipitor, Niaspan (just recently), Atenelol, and aspirin. Should I seek a second opinion or is this blockage anything I should be overly concerned with?