oa Cardiovascular Journal of Africa - Radiofrequency ablation of the slow pathway for treatment of atrioventricular nodal re-entrant tachycardia
Background. Atrioventricular nodal re-entrant tachycardia (AVNRT) is the commonest cause of supraventricular tachycardia (SVT) and forms 35 % of our experience of SVT referred for radiofrequency (RF) ablation. We report on the results of catheter-delivered RF ablation in 93 patients (mean follow-up 20 months). There were 64 females and 29 males, mean age 46 years (range 15 - 76 years). All patients were symptomatic and in all anti-arrhythmic drug therapy had failed. Method. We used standard techniques to characterise AV nodal conduction and the variety of AVNRT. Eighty-five cases were of the common and 4 of the uncommon variety of AVNRT, 4 patients having two varieties. The site of RF application was found by combined anatomical and electro physiological mapping to locate the site of the 'slow pathway'. Success was determined by reversal of inducibility of SVT and alteration in AV nodal conduction pattern. All patients who were symptomatic after RF have undergone Holter testing.
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