When would you consider implantable loop recorders for athletes with nonspecific complaints of palpitations/dizziness, without known history of arrhythmias?  

I first do a maximum ECG stress test to see if any arrhythmias could be induced with max exercise. One might also consider a 30-day MCOT monitoring session. The ECG exercise test would also give us some information about the BP response during and after exercise. And, of course, I would start with m...