**6. Risk of tachycardia-induced cardiomyopathy recurrence**

Similarly as in the experimental models, improvement of ventricular systolic function may be often found in one week horizon and full recovery (including chamber size reduction), usually over a time period of 4–6 weeks after rhythm/rate correction. In some patients, size of the left ventricle may remain slightly enlarged [72].

Although there are no recommendations regarding follow-up of the patients who once experienced tachycardia-induced cardiomyopathy, it is advisable to observe such patients closely for at least one or two years after the initial manifestation. The reason for it is certain, although not specifically determinable risk of arrhythmia recurrence that may induce new and rapid decrease of left-ventricular ejection fraction despite cardiomyopathy could develop within months during the initial episode. Patients experiencing the recurrence of tachycardiainduced cardiomyopathy are at higher risk of sudden death [72] and implantation of an ICD may be thus considered in these cases.
