I am so happy to have found this site, it's been such a comfort to me. Well for starters, I am 38, female, excersize 5 days a week, and am fairly fit. About 10 years ago I started to notice a fast heart beat(all the time) and pvc's. My doctor wasn't concerned. As the yeas passed it got faster and the pvc's were more frequent, and then it started to cause pain in my chest and down my left arm. I was sent to a cardiol. who was concerned, mostly because of family history. I had a thallium stress test and they found my LAD looked like it had a partial blockage. I then went for a cardiac cath that showed it was caused by bridging, not a blockage after all. My Dr. said this was fairly common, and not to worry, but to avoid any heavy lifting, and real strenous work. He stated it was congenital, and won't progress. Why did I never feel anything before? If this is so common, how come I can't find any information on it? Could you please tell me more about this? I also have SVT, and my heart will get up to about 160bpm, I'm currently on metoprolol 25mg twice a day which really helps. I also want to know if the bridging is causing the fast heart rate, and what else could it cause? He is concerned about my cholesterol because of the narrow area in my artery. How narrow did it have to be to show on the stress test? Over 70% like a blockage? I'm sorry about so many questions, but when he told me, I was so shocked I kind of went blank. Any information would be greatly appreciated.