Hyperthermia dependence of cardiac conduction velocity in rat myocardium: Optical mapping and cardiac near field measurements

Hyperthermia dependence of cardiac conduction velocity in rat myocardium: Optical mapping and cardiac near field measurements
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大鼠心肌传导速度的热依赖性:光学测绘和心脏近场测量

DOI:
10.1109/embc.2017.8037658
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发表时间:
2017
期刊:
2017 39th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)
影响因子:
--
通讯作者:
G. Seemann
G. Seemann
中科院分区:
--
文献类型:
--
作者:
S. Pollnow;R. Arnold;M. Werber;O. Dössel;G. Seemann

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射频消融过程中的高温会引起心脏组织电生理特性的可逆和不可逆变化。然而,其机制尚不完全清楚。采用同步光学标测和微型电极阵列技术,从宏观到微观研究了高温条件下大鼠心肌传导速度(CV)的变化。在36.7°C和43.8°C之间的组织浴温度下灌注来自5只大鼠的心房制备物。光学映射数据显示,当温度从36.7°C升高至42.0°C时,中值CV升高21%。CV在42.0°C以上不增加。电测量显示CV在36.7°C和42.0°C之间具有类似的温度依赖性,即中值CV增加26%。在这项研究中的光学和电学数据的合并允许在全球热疗的激发调查。宏观光学映射和微观电学测量表明,高温强烈影响微观尺度上的电传播。
Hyperthermia during radiofrequency ablation causes reversible and irreversible changes of the electrophysiological properties of cardiac tissue. However, the mechanisms are incompletely understood. We studied changes of conduction velocity (CV) in rat myocardium under hyperthermic conditions from macroscopic to microscopic scale by using simultaneous optical mapping and a miniaturized electrode array. Atrial preparations from five rats were superfused at tissue bath temperatures between 36.7°C and 43.8°C. Optical mapping data showed an elevated median CV by 21% when increasing the temperature from 36.7°C to 42.0°C. CV did not increase above 42.0°C. Electrical measurements revealed a similar temperature dependence of CV between 36.7°C and 42.0°C, i.e. an increase of median CV by 26%. The consolidation of optical and electrical data in this study allowed investigation of excitation during global hyperthermia. Macroscopic optical mapping and microscopic electrical measurements demonstrated that hyperthermia strongly influenced electrical propagation at a microscopic scale.
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