could lack of adequate blood flow to the heart muscle cause angina without blockage? I have a heart that races a lot, the doctor has talked about putting a def. in for the racing, some time I've has passed out, but always come back to. is this because there not a lot of blood getting to the heart. I've had a cath done and it's shows there no blockages, I do take plavix and nitro and blood pressure pills, if I have no blockage, why i'm I taking plavix? when I take the nitro, the pains do go away.