Objective To analyze the unipolar electrogram from successful and unsuccessful ablation sites of focal atrial tachycardia (AT), and to evaluate its value in the identification of successful targets.Methods Fifteen con...Objective To analyze the unipolar electrogram from successful and unsuccessful ablation sites of focal atrial tachycardia (AT), and to evaluate its value in the identification of successful targets.Methods Fifteen consecutive patients with focal AT were referred for radiofrequency catheter ablation (RFCA). Both unipolar (from the tip electrode of ablating catheter) and bipolar (from the distal pair of electrode of ablating catheter) electrograms were used to identify the ablation targets of focal AT.Results Successful ablation was echieved in 14 patients. Radiofrequency energy was delivered at a total of 27 sites. The bipolar electrograms associated with successful ablation sites showed earlier atrial deflection relative to P wave onset (36 ms±15 ms vs 30 ms±11 ms, P <0.05) than the electrograms associated with failed ablation sites. At the 14 successful ablation sites, the unipolar electrograms displayed a completely negative atrial wave (“QS” morphology ) beginning with intrinsic deflection. However, at the 13 unsuccessful ablation sites,a “rS” morphology of atrial wave was shown on the unipolar electrogram.Conclusion The “QS” morphology of the atrial wave on unipolar electrograms appears to represent a reliable marker for identifying the successful ablation targets of focal AT, with a high sensitivity and specificity .展开更多
采用冠状窦和二尖瓣环单极记录标测左侧显性旁道和确定消融靶点指导射频消融治疗20例预激综合征。同步记录多部位冠状窦单极电图均清楚显示房波(UP)和室波(UR),其旁道定位点表现为 UP 降支和 UR 起始几乎融合构成特征性的复合波——PQS ...采用冠状窦和二尖瓣环单极记录标测左侧显性旁道和确定消融靶点指导射频消融治疗20例预激综合征。同步记录多部位冠状窦单极电图均清楚显示房波(UP)和室波(UR),其旁道定位点表现为 UP 降支和 UR 起始几乎融合构成特征性的复合波——PQS 波,而远离旁道的单极电图显示 UP 和 UR 分离构成 P—QS 或 P—rS 波。二尖瓣环单极记录时其图形变化类同冠状窦。比较冠状窦标测点和二尖瓣环单极电图的图形特征能迅速、直观地确定消融靶点。展开更多
文摘Objective To analyze the unipolar electrogram from successful and unsuccessful ablation sites of focal atrial tachycardia (AT), and to evaluate its value in the identification of successful targets.Methods Fifteen consecutive patients with focal AT were referred for radiofrequency catheter ablation (RFCA). Both unipolar (from the tip electrode of ablating catheter) and bipolar (from the distal pair of electrode of ablating catheter) electrograms were used to identify the ablation targets of focal AT.Results Successful ablation was echieved in 14 patients. Radiofrequency energy was delivered at a total of 27 sites. The bipolar electrograms associated with successful ablation sites showed earlier atrial deflection relative to P wave onset (36 ms±15 ms vs 30 ms±11 ms, P <0.05) than the electrograms associated with failed ablation sites. At the 14 successful ablation sites, the unipolar electrograms displayed a completely negative atrial wave (“QS” morphology ) beginning with intrinsic deflection. However, at the 13 unsuccessful ablation sites,a “rS” morphology of atrial wave was shown on the unipolar electrogram.Conclusion The “QS” morphology of the atrial wave on unipolar electrograms appears to represent a reliable marker for identifying the successful ablation targets of focal AT, with a high sensitivity and specificity .
文摘采用冠状窦和二尖瓣环单极记录标测左侧显性旁道和确定消融靶点指导射频消融治疗20例预激综合征。同步记录多部位冠状窦单极电图均清楚显示房波(UP)和室波(UR),其旁道定位点表现为 UP 降支和 UR 起始几乎融合构成特征性的复合波——PQS 波,而远离旁道的单极电图显示 UP 和 UR 分离构成 P—QS 或 P—rS 波。二尖瓣环单极记录时其图形变化类同冠状窦。比较冠状窦标测点和二尖瓣环单极电图的图形特征能迅速、直观地确定消融靶点。
