首页> 外文期刊>American Journal of Physiology >Changes in activation sequence of embryonic chick atria correlate with developing myocardial architecture.
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Changes in activation sequence of embryonic chick atria correlate with developing myocardial architecture.

机译:雏鸡心房激活序列的变化与心肌结构的发展有关。

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摘要

To characterize developmental changes in impulse propagation within atrial musculature, we performed high-speed optical mapping of activation sequence of the developing chick atria using voltage-sensitive dye. The activation maps were correlated with detailed morphological studies using scanning electron microscopy, histology, and whole mount confocal imaging with three-dimensional reconstruction. A preferential pathway appeared during development within the roof of the atria, transmitting the impulse rapidly from the right-sided sinoatrial node to the left atrium. The morphological substrate of this pathway, the bundle of Bachman, apparent from stage 29 onward, was a prominent ridge of pectinate muscles continuous with the terminal crest. Further acceleration of impulse propagation was noted along the ridges formed by the developing pectinate muscles, ramifying from the terminal crest toward the atrioventricular groove. In contrast, when the impulse reached the interatrial septum, slowing was often observed, suggesting that the septum acts as a barrier or sink for electrical current. We conclude that these inhomogeneities in atrial impulse propagation are consistent with existence of a specialized network of fast-conducting tissues. The purpose of these preferential pathways appears to be to assure synchronous atrial activation and contraction rather than rapid impulse conduction between the sinoatrial and atrioventricular nodes.
机译:为了表征冲动在心房肌内传播的发展变化,我们使用电压敏感染料对发育中的雏鸡心房的激活序列进行了高速光学映射。激活图与使用扫描电子显微镜,组织学和三维重建的整体共聚焦成像的详细形态学研究相关。在心房顶内发育期间出现了一条优先途径,将冲动从右侧窦房结迅速传递到左心房。从第29阶段开始,这种途径的形态学底物即巴赫曼氏束是明显的果胶肌脊,与末端波峰连续。沿着由发展中的果胶状肌肉形成的脊,注意到脉冲的传播进一步加速,从末端波峰向房室沟延伸。相反,当脉冲到达房间隔时,通常会观察到速度变慢,这表明间隔充当电流的屏障或吸收器。我们得出结论,心房脉冲传播中的这些不均匀性与快速传导组织的专门网络的存在是一致的。这些优先途径的目的似乎是为了确保同步的心房激活和收缩,而不是确保窦房结和房室结之间的快速冲动传导。

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