Nakai K, Syobuzawa M, Itoh C, Miyakawa T, Kato M, Onishi T, Kasanuki H, Hosoda S
Department of Clinical Pathology, Iwate Medical University, Japan.
Angiology. 1990 Aug;41(8):639-46. doi: 10.1177/000331979004100808.
For evaluating the spatial location of late potentials (LPs), the authors designed a new system for the body surface mapping of signal-averaged, filtered ECGs using forty-five thoracic unipolar leads (5 x 9 array). The signals from patients with old myocardial infarction (MI, N = 7) and arrhythmogenic right ventricular dysplasia (ARVD, N = 1) were amplified and passed through a bandpass (100-300 Hz) filter. The departure maps, LP isopotential maps, and LP30 area maps were generated and superimposed. The LP30 duration was determined as the section between the filtered QRS endpoints and points thirty milliseconds (ms) before. Isopotential maps of the LPs showed distinct positive and negative regions. In 7 cases with MI, the extreme was related to the zones indicated by the departure maps, and the LP30 area maps also corresponded to the departure areas. In 1 case of ARVD, endocardial fragmented activity directly recorded at the right ventricle closely corresponded with the region on the LP30 area map. In conclusion, body surface LP isopotential maps and LP30 area maps may provide useful information concerning the spatial distribution of endocardial fragmentation.
为评估晚电位（LPs）的空间位置，作者设计了一种新系统，用于使用45个胸段单极导联（5×9阵列）对信号平均、滤波后的心电图进行体表标测。来自陈旧性心肌梗死（MI，N = 7）和致心律失常性右室发育不良（ARVD，N = 1）患者的信号被放大，并通过带通（100 - 300 Hz）滤波器。生成并叠加了离散图、LPs等电位图和LP30面积图。LP30持续时间被确定为滤波后QRS波终点与之前30毫秒（ms）处点之间的区间。LPs的等电位图显示出明显的正负区域。在7例MI患者中，极值与离散图所示区域相关，LP30面积图也与离散区域相对应。在1例ARVD患者中，直接记录于右心室的心内膜碎裂活动与LP30面积图上的区域密切对应。总之，体表LPs等电位图和LP30面积图可能提供有关心内膜碎裂空间分布的有用信息。
