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Novel experimental results in human cardiac electrophysiology: measurement of the Purkinje fibre action potential from the undiseased human heart

机译:人类心脏电生理学的新实验结果:从未患病的人类心脏测量浦肯野纤维动作电位

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Data obtained from canine cardiac electrophysiology studies are often extrapolated to the human heart. However, it has been previously demonstrated that because of the lower density of its K+ currents, the human ventricular action potential has a less extensive repolarization reserve. Since the relevance of canine data to the human heart has not yet been fully clarified, the aim of the present study was to determine for the first time the action potentials of undiseased human Purkinje fibres (PFs) and to compare them directly with those of dog PFs. All measurements were performed at 37 degrees C using the conventional microelectrode technique. At a stimulation rate of 1 Hz, the plateau potential of human PFs is more positive (8.0 +/- 1.8 vs 8.6 +/- 3.4 mV, n = 7), while the amplitude of the spike is less pronounced. The maximal rate of depolarization is significantly lower in human PKs than in canine PFs (406.7 +/- 62 vs 643 +/- 36 V/s, respectively, n = 7). We assume that the appreciable difference in the protein expression profiles of the 2 species may underlie these important disparities. Therefore, caution is advised when canine PF data are extrapolated to humans, and further experiments are required to investigate the characteristics of human PF repolarization and its possible role in arrhythmogenesis.
机译:从犬的心脏电生理研究中获得的数据通常外推到人的心脏。然而,先前已经证明,由于其K +电流的密度较低,人心室动作电位具有较弱的复极储备。由于尚未充分阐明犬类数据与人心脏的相关性,因此本研究的目的是首次确定未患病的人浦肯野纤维(PFs)的动作电位,并将其直接与狗的动作电位进行比较。 PF。使用常规的微电极技术,所有测量均在37摄氏度下进行。在1 Hz的刺激速率下,人PF的平台电位更强(8.0 +/- 1.8 vs 8.6 +/- 3.4 mV,n = 7),而尖峰的幅度不太明显。人PK中的最大去极化速率显着低于犬PF(分别为406.7 +/- 62和643 +/- 36 V / s,n = 7)。我们假设这两个物种的蛋白质表达谱中的明显差异可能是这些重要差异的基础。因此,在将犬PF数据外推至人时,应谨慎行事,并且需要进一步的实验来研究人PF复极化的特征及其在心律失常中的可能作用。

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