Atrial Tachycardia: A Novel Classification and Contemporary Management.

Atrial tachycardias (ATs) are increasingly recognized in clinical practice and are associated with a high symptom burden, frequent hospitalizations, and adverse cardiovascular outcomes. Despite their growing importance, management has historically been embedded within broader supraventricular tachycardia guidelines, resulting in heterogeneous treatment approaches. Recent advances in mechanistic understanding, electroanatomical mapping, and ablation technologies have substantially refined the diagnostic and therapeutic landscape. This state-of-the-art review discusses the evolution of AT management by placing the recent international clinical consensus statement into the context of contemporary guidelines and expert documents. A central development is the transition from an electrocardiogram-based descriptive characterization to a unified, mechanistic classification distinguishing non-re-entrant, localized reentrant, and macro-re-entrant AT, with direct implications for diagnostic and therapeutic strategies. Across documents, acute management is shifting toward a more pragmatic, mechanism-independent approach, with increasing prioritization of early cardioversion over empirical pharmacological therapy in symptomatic patients. In parallel, a progressive downgrading of antiarrhythmic drug therapy is evident, accompanied by an expanding role of catheter ablation as the most effective rhythm control strategy. Notably, the consensus statement further advances this paradigm by recommending catheter ablation for any symptomatic, recurrent AT irrespective of mechanism embedded in a 10-Point Plan for SMART-AT care. Emerging concepts, including arrhythmia-induced cardiomyopathy and mechanism-based anticoagulation strategies, additionally refine patient selection and long-term management, also reflecting evolutionary steps of treatment guidelines. Collectively, these recent developments position AT as a distinct clinical entity within modern electrophysiological practice and support early intervention to improve clinical outcomes.