What is a heart arrhythmia? (Marcie Berger, MD) Marcie Berger, MD, electrophysiologist, explains what a heart arrhythmia is. Dr. Berger is part of the Froedtert & the Medical College of Wisconsin Arrhythmia Program. Featured in this Video Doctors Marcie G Berger MD-FACC Medical services Arrhythmia, Irregular Heartbeat Symptoms Locations Froedtert Hospital