200lb, active. rcntly, had palpitations over 4 days, ecg was 'normal'.but cardiologiest suspects av dissociation. could this be benign or serious? palp gone now, on event mtr.stress echo test pending.

Palpitations: It sounds like you are receiving the correct work-up with ecg, stress echo, and event monitor. You should already have had blood tests for electrolytes, thyroid, and red blood counts. If the tests all come back normal, and your palpitations continue, then you may need to wear the event monitor longer to see if it picks up any arrhythmias.Could be serious if any associated chest pain or dizziness.