question: I m a 29 year old female nursing student with some sort of exercise induced SVT/PSVT syptoms. I was on a cardiac event monitor for 2 months. My heart had small episodes of PAC s, PVC,s and PACs with couplets but while wearing the monitor it never did the real thing . I m a musician, so I m familiar with rhythm and have counted my HR at 250-260 during one of these episodes if not higher. The cardiology office I go to said the SA Node is not capable of beating that fast...or conducting that quickly rather. Please advise, is this serious? I exercise a lot and that s the only time it happens. I need peace of mind on this.