To ensure the best outcomes, cardiologist must have a deep understanding of the design, manufacturing, and malfunctions of implantable devices. This issue of Cardiac Electrophysiology thoroughly examines implantable devices, providing the most reliable and updated information. Topics include MRI conditionally safe pacemakers, complications in lead extraction, troubleshooting malfunctioning pacemakers and ICDs.

This issue of Cardiac Electrophysiology Clinics--edited by Drs. Amin Al-Ahmad, Raymond Yee, and Mark Link--will focus on Contemporary Issues in Patients with Implantable Devices. Topics include, but are not limited to: Management of Device infections; Device longevity; Inappropriate ICD therapies; ILR for cryptogenic stroke; ICD implantation without DFT testing; S-ICD; Lead extraction; Use of the WCD as a bridge to ICD; Important parameters for ICD selection; Leadless pacemakers; Management of perioperative anticoagulation for device implantation; HIS bundle pacing; Single coil ICD leads; Venous system interventions for device implantation; and Remote monitoring.

This issue of Cardiac Electrophysiology Clinics examines electrocardiography of complex arrhythmias. Topics include concealed conduction, right and left atrial macroreentrant tachycardias, focal atrial fachycardias, AV nodal and AV reentrant tachycardia, wide complex tachycardias, ventricular tachycardia in CAD, ECG characteristics of outflow tract VT, fascicular tachycardias, VT in non-ischemic dilated cardiomyopathy, VT originating from unusual sites, incessant VT and VT storms, ECG characteristics of TdP, VT in ARVC, and ventricular arrhythmia in inherited channelopathies, arrrhythmias in complex congenital heart disease, AV conduction disease and block, electrocardiographic analysis of paced rhythms.

This issue of Cardiac Electrophysiology Clinics devoted to syncope a disorder that is associated with increased mortality. Internationally recognized experts discuss the many causes of syncope, helping the clinician to distinguish life-threatening etiologies from benign ones.

Because atrial fibrillation promotes the formation of blood clots that can travel to the brain and block an artery, atrial fibrillation independently increases the risk of ischemic stroke four-to-five-fold. In this issue expert authors review drug therapies for stroke prevention, use of the new anticoagulants, ablation strategies for stroke prevention, LAA closure for stroke prevention, stroke in heart rhythm device patients, transesophageal echo in atrial fibrillation, and other topics important to the management of this serious complication.

This issue of Cardiac Electrophysiology Clinics examines Frontiers in Non-invasive Cardiac Mapping. Topics include imaging of heart rhythm disorders, experimental validation and modeling of validation, challenges and future directions of inverse problems, phase mapping of cardiac fibrillation, frequency domain analysis, analysis of diagnostic 12-lead electrocardiography and 3D non-invasive mapping, and many more.

The sodium channel, a ubiquitous member of the cardiac, neural, and muscular conduction systems, has been implicated in the pathogenesis of an array of human diseases. Mutations associated with the cardiac sodium channel are responsible for a wide spectrum of disorders. The cardiac sodium channel and associated disorders are comprehensively examined in this issues of the Cardiac Electrophysiology Clinics.