The following case illustrates several important features: firstly, the occurrence of tachycardia-induced cardiomyopathy during sustained atrial tachycardia at a relatively modest heart rate of 130 beats per minute, in an elite athlete. Secondly, tachycardia may induce severe and occasionally life-threatening impairment of the systolic ventricular function without a history of palpitations. Finally, our patient is an excellent example of the complete recovery that may follow successful radiofrequency catheter ablation, performed promptly once the correct diagnosis has been confirmed.