I have a 20-plus year history of arrhythmias, which I manage without medications. My cardiologist said I shouldn't worry, because my mother also had this problem, and she is now 91. Recently, I have been experiencing "pushes" in the center of my chest lasting only a few seconds. I also get breathless when climbing stairs or walking briskly. I am 63, exercise regularly and eat a healthy diet. Should I be tested for coronary artery disease, and if so, what kind of test should I have?