Junctional ectopic tachycardia revisited.

Junctional ectopic tachycardia (JET) is an uncommon arrhythmia, but it can have devastating consequences when it occurs. Most physicians are not familiar with its diagnosis, which can seriously compromise management in emergency rooms. Many cases arise in the postoperative period following cardiovascular surgery. In this context, the arrhythmia significantly worsens the prognosis of patients. A particularly severe form of JET is congenital, which has a mortality rate of up to 35%. The diagnosis can be made from the fetal period to six months of age. JET is infrequently diagnosed in otherwise healthy adults. Some medical conditions have been associated with the occurrence of JET. In the electrocardiogram, the most prominent characteristics of the arrhythmia are atrioventricular dissociation, narrow QRS complexes, and R-R interval irregularity due to intermittent ventricular captures. A notable feature of JET is the lack of response to treatment in many patients. Management options are divided into general and specific measures. General measures include avoiding hyperthermia, pain control, and minimizing the use of exogenous catecholamines. Specific treatment involves antiarrhythmic drugs, temporary atrial pacing, and ablation.