The goal of this book is to provide an integrated overview of some intriguing problems of cardiac electrophysiology. Topics have been selected that encompass mainly aspects which have been a matter of concern and interest in our Department over the past few years. We requested from the authors not only that they provide information about their own investiga- tions, but also that they integrate their results with those published by oth- ers. Furthermore, we urged them to be speculative in their interpretations in order to encourage exploration of related areas of investigation. To this end,...