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.
复制标题
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:
影响因子:
--
通讯作者:
Strauss,HC
中科院分区:
文献类型:
--
作者:
Browning,DJ;Strauss,HC
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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影响因子:
5
作者:
F. Palfi;H. R. Besch;A. M. Watanabe
通讯作者:
A. M. Watanabe
DOI:
10.1016/0002-9149(71)90226-8
发表时间:
1971
期刊:
The American journal of cardiology
影响因子:
--
作者:
P. Polimeni;M. Vassalle
通讯作者:
M. Vassalle
影响因子:
2
作者:
P. Wiggins
通讯作者:
P. Wiggins
DOI:
10.1098/rstb.1975.0052
发表时间:
1975
期刊:
Philosophical transactions of the Royal Society of London. Series B, Biological sciences
影响因子:
--
作者:
T. Zeuthen;C. Monge
通讯作者:
C. Monge
影响因子:
20.1
作者:
G. Grupp
通讯作者:
G. Grupp