Focal atrial tachycardia is a rare type of supraventricular tachyarrhythmia, generally present in young people, and is a rare cause of tachycardiomyopathy (10%). We present a clinical case of tachycardiomyopathy in a 30-year-old man, without comorbidities, who was diagnosed with incessant focal atrial tachycardia, refractory to medical therapy, and electrical cardioversion. Succesful endocardial ablation was performed,  and in outpatient follow-up at 6 months, he showed a recovery of the left ventricular ejection fraction and reduction of the left chambers to normal ranges, with progressive decrease of dyspnea.

Focal atrial tachycardia is a rare type of supraventricular tachyarrhythmia, generally present in young people, and is a rare cause of tachycardiomyopathy (10%). We present a clinical case of tachycardiomyopathy in a 30-year-old man, without comorbidities, who was diagnosed with incessant focal atrial tachycardia, refractory to medical therapy, and electrical cardioversion. Succesful endocardial ablation was performed,  and in outpatient follow-up at 6 months, he showed a recovery of the left ventricular ejection fraction and reduction of the left chambers to normal ranges, with progressive decrease of dyspnea.

La taquicardia atrial focal es un tipo de taquiarritmia supraventricular poco prevalente, generalmente presente en jóvenes, y constituye una causa rara de taquicardiomiopatía (10%). Presentamos un caso clínico de taquicardiomiopatía en un varón de 30 años, sin comorbilidades, que fue diagnosticado de taquicardia atrial focal incesante, refractaria a terapia médica y cardioversión eléctrica, por lo que se realizó ablación endocárdica, la misma que fue exitosa y en seguimiento ambulatorio a los 6 meses evidenció una recuperación de la fracción de eyección del ventrículo izquierdo y reducción de cavidades izquierdas a rangos normales, con disminución progresiva de disnea.