Three Cases of Tachycardia-Induced Cardiomyopathy Caused by Supraventricular Tachyarrhythmias

We here report the 3 cases of tachycardia-induced cardiomyopathy caused by supraventricular tachycardia (SVT) with different mechanisms, which were successfully treated by radio-frequency catheter ablation RFCA. Case 1: A 54-year-old woman was referred to our hospital because of congestive heart failure and a SVT with HR 180 bpm. She had shortness of breath for 5 years. The mechanism of the SVT was an atrial flutter rotating the crista terminalis in the right atrium. She was treated by RFCA, resulting in the recovery of LV function. Case 2: A 31 year-old man presented with shortness of breath. He was found long RP′ tachycardia with HR 150 bpm and a severe LV dysfunction (LVEF 20%), which was improved by tachycardia control with amiodarone. EPS revealed that the mechanism of the tachycardia was a fast-slow AVNRT. Case 3: A 23 year-old man was transferred to our hospital because of a severe LV dysfunction and enlargement (EF 12%, LVDd 75 mm). He presented with incessant long RP′ tachycardia of HR 120–160 bpm. The mechanism of the tachycardia was an atrial tachycardia originating from peri-tricuspid valve. His LV function was gradually improved at 1 year after RFCA (EF 48%, LVDd 45 mm). Take together, the treatments of SVTs by RFCA are effective to improve LV function in tachycardia-induced cardiomyopathy.