About 20 years ago, the definition of atrial fibrillation (AF) seemed to be a very straight forward one: An irregularly irregular heart rhythm, with no discernible P-waves and, ideally, detectable fibrillatory waves in between QRS complexes. Over the years, however, advancing technology as well as increased awareness of AF and its dire consequences - heart failure and stroke in particular - have resulted in an increasing amount of “patients” being diagnosed with electrical features compatible with AF by various methodological and technical means [1].
