DX single-lead implantable cardioverter-defibrillator system with a floating atrial dipole: when, to whom, and why?

The article reflects information for cardiologists, cardiac surgeons, doctors pro­gramming implanted antiarrhythmic devices, employees and residents of the depart­ments of cardiology and cardiac surgery. Most often, we choose a model of an implantable cardioverter-defibrillator (ICD) strictly individually for each patient, based on the anamnesis characteristics, safety and highest efficiency of ICD systems offered on the market. With each new ICD model, manufacturing companies strive to minimize the number of implantable components and develop better algorithms to discriminate between atrial tachyarrhythmias and true ventricular tachyarrhythmias. However, the risk of inappropriate ICD therapy still remains high. Thus, attending physicians and cardiologists programming implantable antiarrhythmic devices often face difficulties in correcting ICD settings and planning further treatment of a patient with shocks caused by atrial tachyarrhythmias. The authors sought to form an idea about the features of a single-chamber ICD recording atrial potentials using a floating dipole, as well as the advantages of the DX system over classical single-chamber ICD systems, and to define a type of a patient for whom this implantable system would be the best choice preventing sudden cardiac death.