三尖瓣环传导时间在确定典型心房扑动消融终点中的价值Determination of ablative end-point for typical atrial flutter by tricuspid valve annulus conductional time
张树龙,刘少奎,高连君,李世军,林治湖,杨延宗
摘要(Abstract)：
目的评价三尖瓣环的传导时间在确定心房扑动(房扑)消融终点中的价值。方法19例经体表心电图证实为典型房扑的患者,在心动过速中根据房扑激动顺序及拖带标测证明折返环沿三尖瓣环运行。测定房扑周长(tachycardial interval,TCL)及起搏后间期(post-pacing interval,PPI)。在三尖瓣环与下腔静脉之间的峡部消融,经冠状窦口及低位右心房起搏证明峡部双向阻滞。分别在冠状窦口、冠状窦远端及高位右心房刺激,用大头电极在峡部消融线上记录在3个部位起搏时的双电位间期(double potential interval,DPI),DPI=刺激信号至第二个电位间期(T2)-刺激信号至第一个电位间期(T1);三尖瓣环传导时间(tricuspid valve annulus conductiontime,TACT),TACT=(T1+T2)-(PPI-TCL);计算TACT/TCL。结果19例患者在消融术中均形成峡部双向阻滞,无并发症发生,停用任何抗心律失常药物,平均随访(27±8)个月,复发1例,经再消融后成功。TCL为210~385ms(平均267·21±36·64ms),冠状窦近端测得的PPI为235~390ms(平均291·32±42·88ms),冠状窦远端PPI为273~450ms(平均334·25±43·04ms),高位右心房的PPI为230~385ms(平均277·13±35·91ms)。提示高位右心房及冠状窦口接近折返环(与TCL相比,P>0·05),而冠状窦远端远离折返环(与TCL相比,P<0·05)。经冠状窦口及低位右心房起搏证实峡部双向阻滞后,分别于冠状窦口、冠状窦远端及高位右心房起搏测定DPI,分别为(152·56±56·66)ms,(150·08±48·35)ms及(85·6±34·47)ms。高位右心房起搏时DPI与冠状窦起搏时比较差异有统计学意义(P<0·05)。3个部位计算的TACT分别为(234·72±58·03)ms、(219·73±40·87)ms,(232·3±43·24)ms,差异无统计学意义。三个部位计算的TACT/TCL分别为(0·87±0·14),(0·82±0·12)及(0·91±0·15),差异无统计学意义。结论三尖瓣环传导时间不受起搏部位的影响,仅与环内折返运动时间长短有关。不论房扑周长的长短及双电位间期的大小,只要三尖瓣环传导时间与房扑周长之比接近于1,提示峡部完全阻滞。
关键词(KeyWords)： 心房扑动;导管消融术;三尖瓣
基金项目(Foundation):
作者(Author): 张树龙,刘少奎,高连君,李世军,林治湖,杨延宗
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