Analysis of atrioventricular function and its efficacy in patients with AVNRT undergoing atrioventricular junction ablation of slow conduction pathway / 中国基层医药

ABSTRACT

Objective The electrophysiological parameters of atrioventricular conduction function in patients with atrioventricular nodal reentry tachycardia (AVNRT)were analyzed,and to explore the effect of different ablation endpoints on atrioventricular conduction function in patients with AVNRT.Methods 96 cases with AVNRT under-went radiofrequency catheter ablation (RFCA)of slow conduction pathway.According to whether the slow pathway eliminated,the patients were divided into the slow pathway disappeared group and slow tracks remaining group.Preop-erative and postoperative intracavitary electrophysiological examination and atrioventricular function data were recor-ded,including before and after radiofrequency ablation of bundle of HIS,PA,AH,HV interval,atrioventricular prequel venturi point(AVN -WKB),ventriculoatrial retrograde venturi point(VAN -WKB),atrioventricular node prequel effective refractory period(AVB -WKB).Patients were followed up by telephone for a year.Then,a comparative anal-ysis of preoperative and postoperative was done.Results RFCA of AVNRT patients with atrioventricular node pre-quel time effectRFCA and preoperative ratio,after his bundle electrogram PA,ah,HV interval had no significant changes(P >0.05).Effect of RFCA surgery on patients with AVNRT refractory atrioventricular node prequelcom-pared with RFCA before surgery,postoperative slow pathway disappear fast pathway shortening of effective refractory period[preoperative(287.5 ±46.2)ms,postoperative(260.2 ±55.6)ms,t =2.901,P =0.005],slow pathway effec-tive refractory period[disappear preoperative(243.3 ±43.2),postoperative(0.0 ±0.0)ms,t =43.290,P =0.000], AV node Wenckebach point in advance before operation[(261.3 ±44.3)ms,postoperative(293.2 ±46.2)ms,t =3.828,P =0.000];group after slow pathway to improve fast pathway effective refractory period without obvious change (P >0.05 ),the slow pathway effective refractory period in high concentration [preoperative (242.2 ± 42.8)ms,postoperative(281.2 ±41.3 )ms,t =3.879,P =0.000〗,atrioventricular node Wenckebach point in advance before operation[(261.5 ±43.5)ms,postoperative(291.3 ±46.5)ms,t =2.769,P =0.007〗.Comparison between groups,after slow pathway disappeared group fast pathway effective refractory period was significantly shorter in the slow diameter improvement group,but between the two groups in the atrioventricular node Wenckebach point differences was not statistically significant(P >0.05).There was no recurrence in the follow -up after a year of slow path loss and slow pathway.Conclusion RFCA caused by slow pathway to disappear or modified two slow pathway ablation right AVNRT patients atrioventricular time had no effect,but all the atrioventricular junction the prequel's point advance.The atrioventricular node slow pathway disappear fast and effective pathway refractory period short-ened,slow pathway improved the slow pathway effective refractory period.RFCA surgery done by the slow pathway dis-appeared or slow pathway ablation is effective in patients with AVNRT,and there was no significant recurrence rate in both groups within 1 year.