Effects of stimulation frequency on potassium activity and cell volume in cardiac tissue.

Effects of stimulation frequency on potassium activity and cell volume in cardiac tissue.
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刺激频率对心脏组织中钾活性和细胞体积的影响。

DOI:
10.1152/ajpcell.1981.240.1.c39
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发表时间:
1981
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
Strauss,HC
Strauss,HC
中科院分区:
--
文献类型:
--
作者:
Browning,DJ;Strauss,HC

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我们研究了刺激频率增加对猫科动物和犬科动物浦肯野纤维以及猫科动物心室纤维的细胞内钾活性和细胞体积的影响。使用单管和双管配置的钾液体离子交换微电极测量细胞内钾活性。用电生理技术测量细胞体积。根据单筒电极记录,猫浦肯野纤维、猫乳头肌和犬浦肯野纤维的细胞内钾活性(平均值+/- SE)分别为 117.1 +/- 5.4、87.3 +/- 3.1 和 112.4 +/- 4.4 mM,[K]o(外部钾浓度)为 5.4 mM。因此,提出了从浦肯野纤维到心室肌的细胞内钾活性存在 30 mM 梯度的直接证据。在 4 Hz 刺激 3 分钟期间或之后,所研究的任何组织中的细胞内钾活性均未发生变化。缺乏变化的部分原因是刺激方案引起的细胞体积可逆地减少了 2%。早期研究中发现的大于 2% 的净损失可能反映了灌注制剂与灌注制剂之间的差异,或者反映了频率变化期间参与转移的细胞钾的功能性隔离。
We examined the effects of increases in stimulation frequency on the intracellular potassium activity and cell volume of feline and canine Purkinje fibers and feline ventricular fibers. Intracellular potassium activity was measured with potassium liquid ion exchanger microelectrodes in single- and double-barrel configuration. Cell volume was measured with an electrophysiologic technique. From single-barrel electrode recordings, intracellular potassium activities (means +/- SE) in feline Purkinje fiber, feline papillary muscle, and canine Purkinje fiber are 117.1 +/- 5.4, 87.3 +/- 3.1, and 112.4 +/- 4.4 mM, respectively, with [K]o (external potassium concentration) of 5.4 mM. Thus direct evidence for a 30-mM gradient in intracellular potassium activity from Purkinje fiber to ventricular muscle is presented. Intracellular potassium activity did not change in any tissue studied during or after 3 min of 4 Hz stimulation. The lack of change is partially explained by a reversible 2% decrease in cell volume induced by the stimulation protocol. Net losses greater than 2% seen in earlier studies probably reflect either differences between perfused vs. superfused preparations or functional sequestration of cellular potassium involved in transfers during frequency changes.
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