Cardiac arrhythmias most commonly result from the development of a re-entry circuit caused by a developmental anomaly (e.g. Wolff-Parkinson White Syndrome where the re-entrant pathway is due to the presence of a congenital accesory pathway) or a myocardial scar. The destruction of this and any other abnormal electrical circuits is termed 'ablation therapy'. Radiofrequency ablation came into clinical practice at the end of the 1980's and revolutionise the way patients with abnormal heart rhythms could be treated and sometimes cured.
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