In cases with right bundle branch block,Carto system could fail to ablate IVT due to the ex-tra-systoles caused by the disturbance of mapping-process.

• Carto系统在ILVT(VT时体表12导联心电图表现为完全右束支阻滞伴左前分支阻滞或左后分支阻滞)标测过程中易受室性早搏干扰 ,形成错误的电解剖图而消融失败 ,且费用昂贵和手术时间长