Can you describe how arrhythmias feel like?

Flip Flops . An arrythmia or iabnormal heart beat may be of several types. A tachycardia or rapid rhythm feels like a racing heart but not brought on by exercise. A slow heart beat may lead to fatigue or passing out. The most common arrythmia is due to extra beats which feel like a "flip flop" sensation due to the extra early beat or a pause after the beat with a "sinking" feeling in the chest.