In modern cardiovascular medicine, few domains move as swiftly - or as delicately - as arrhythmia management and electrophysiology. From diagnostic interpretation to device implantation, the decisions we make are often lifesaving. Yet they are also complex, time-sensitive, and at times, legally vulnerable. This book was born from the recognition that while the science of cardiac rhythm is well taught, the medico-legal landscape it inhabits is often underappreciated.