I'm not familiar with PSAT, what does that stand for? I have mitral valve prolapse, angina, and a variety of other goodies. I've been on beta blockers since 1988, and I'm 41. I've noticed the biggest change ever since starting the South Beach Diet. The lack of sugar and "bad carbs" has had a suprising effect! I've not had any arrhythmias, chest pains, or any other symtpoms. I'm back on the treadmill for at least an hour at a time without a beat out of place. I do take a lot of supplements which are supposed to be good for the heart, such as CoQ10, fish oil, folic acid, B6, and a few others recommended by Dr. Dean Ornish. A lot of people with heart irregularities have reported improvements with them. That, along with my new way of eating have contributed to my improvements. I hope you'll see improvements on this diet, as well. It's going to be a lifestyle change, but it's worth it already
Good luck!