I have had 5 heart caths and 7 stents placed starting Feb. 2005, 4 stents, July 2005, 2 stents, Nov. 2006 ,(Non-Qwave myocardial Infarction) 1 stent. A blockage occured in a previously placed stent. I have heart arrhytmias and chest pain several times weekly. Had a cath done in Oct. 2007 and it was clear no blockage found. What could be causing the constant angina and heart palpitations? This really scares me and my family.