Abstract：
BACKGROUND: Mapping of atypical atrial arrythmias arising in the left atrium is often challenging. The Local Activation Time (LAT) Histogram, a new function of the 3D color mapping system CARTO version 7, may help improve identification of atrial tachycardia circuits. We aimed to assess the effectiveness of the LAT Histogram for identification of left atrial tachycardia circuits.
METHODS: This retrospective study compared 25 consecutive cases of left atrial tachycardia that were treated before use of LAT Histogram (unused group) and 25 consecutive cases that were treated after introduction of LAT Histogram (used group) at Nagano Chuo Hospital. We evaluated whether we could identify the circuit of left atrial tachycardia from the electrophysiology lab data during ablation and the CARTO system data and whether we could perform effective ablation.
RESULTS: Door-to-door time, skin-to-skin time, and fluoroscopy time (p ≤ .011) were all shorter in the LAT Histogram used group versus unused group, while mapping analysis times were longer in the used group (p ≤ .019). A significantly greater number of cases in the LAT Histogram used compared with the unused group had ablation for entrance or exit points (19 vs. 10 cases; p = .001 for first map). Ablation resulted in a return to sinus rhythm and changed cycle length at the first mapping in 20 cases (80%) in the LAT Histogram unused group and in 24 cases (96%) in the used group.
CONCLUSIONS: LAT Histogram may provide a simple and effective method to identify entrance and exit locations in left atrial tachycardia.
METHODS: This retrospective study compared 25 consecutive cases of left atrial tachycardia that were treated before use of LAT Histogram (unused group) and 25 consecutive cases that were treated after introduction of LAT Histogram (used group) at Nagano Chuo Hospital. We evaluated whether we could identify the circuit of left atrial tachycardia from the electrophysiology lab data during ablation and the CARTO system data and whether we could perform effective ablation.
RESULTS: Door-to-door time, skin-to-skin time, and fluoroscopy time (p ≤ .011) were all shorter in the LAT Histogram used group versus unused group, while mapping analysis times were longer in the used group (p ≤ .019). A significantly greater number of cases in the LAT Histogram used compared with the unused group had ablation for entrance or exit points (19 vs. 10 cases; p = .001 for first map). Ablation resulted in a return to sinus rhythm and changed cycle length at the first mapping in 20 cases (80%) in the LAT Histogram unused group and in 24 cases (96%) in the used group.
CONCLUSIONS: LAT Histogram may provide a simple and effective method to identify entrance and exit locations in left atrial tachycardia.
摘要：
背景：在左心房出现的非典型房性心律失常的标测通常具有挑战性。本地激活时间(LAT)直方图,3D彩色映射系统CARTO版本7的新功能可能有助于改善房性心动过速回路的识别。我们旨在评估LAT直方图识别左心房心动过速回路的有效性。
方法：这项回顾性研究比较了在长野县医院使用LAT直方图之前治疗的25例连续左房心动过速（未使用组）和引入LAT直方图之后治疗的25例连续病例（使用组）。我们评估是否可以从消融期间的电生理实验室数据和CARTO系统数据中识别左房性心动过速的回路，以及我们是否可以进行有效的消融。
结果：门到门时间，皮肤对皮肤的时间，与未使用组相比，使用LAT直方图组的透视时间（p≤.011）均较短，而使用组的映射分析时间更长（p≤.019）。与未使用的组相比，使用的LAT直方图中的病例数显着更多的病例进行了入口或出口点的消融（19vs.10例；第一张地图的p=.001)。在LAT直方图未使用组中的20例（80％）和在使用组中的24例（96％）中，消融导致首次定位时恢复窦性心律并改变了周期长度。
结论：LAT直方图可以提供一种简单有效的方法来识别左房性心动过速的入口和出口位置。
方法：这项回顾性研究比较了在长野县医院使用LAT直方图之前治疗的25例连续左房心动过速（未使用组）和引入LAT直方图之后治疗的25例连续病例（使用组）。我们评估是否可以从消融期间的电生理实验室数据和CARTO系统数据中识别左房性心动过速的回路，以及我们是否可以进行有效的消融。
结果：门到门时间，皮肤对皮肤的时间，与未使用组相比，使用LAT直方图组的透视时间（p≤.011）均较短，而使用组的映射分析时间更长（p≤.019）。与未使用的组相比，使用的LAT直方图中的病例数显着更多的病例进行了入口或出口点的消融（19vs.10例；第一张地图的p=.001)。在LAT直方图未使用组中的20例（80％）和在使用组中的24例（96％）中，消融导致首次定位时恢复窦性心律并改变了周期长度。
结论：LAT直方图可以提供一种简单有效的方法来识别左房性心动过速的入口和出口位置。
