Correlation between electrophysiological parametrs changes and the recurrence rale of atrioventricular nodal reentrant tachycardia

Objectives:The study is intend to discuse the correlation between the different electrophysiological ends and the recurrence rate of AVNRT after RFCA. Methods:RFCA was performed in 56 patients of AVNRT and cardiac electrophysiological parameters were measured before and after operation.The recurrence rate of AVNRT was investigated in follow up duration. Results:38 patients who slow pathway disappeared after RFCA(Group A) had no one recurrence of AVNRT.12 patients remaining slow pathway without an atrial echo(Group B) had 1 patient(8.33%) recurrence of AVNRT.6 patients remaining slow pathway with one to two atrial echo(Group C) had 2 patients(33.3%) recurrence of AVNRT.In 53 patient without recurrence of AVNRT after RFCA,the A H max interval and fast pathway refractory periods decreasd from (287±27) ms to (196±56) ms( P 0.01) and (330±44) ms to (287±31) ms( P 0.01 ) respectively.While in 3 patient;with AVNRT recurrenced,there are no significant changes in A H max interval (287±31 ms vs 262±38 ms, P 0.05) and fast pathway refractory periods (324±35 vs 313±28 ms, P 0.05). Conclusions:There was a closer correlation between recurrence rate of AVNRT and remining slow pathway.Besides,no significant changes of A H max after RFCA was also a recurrent factor.