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• W2004454757 abstract "1. Voltage clamp experiements studied the ionic basis of the strophathidin-induced transient inward current (TI) in cardiac Purkinje fibres. 2. The reversal potential of TI (Erev) was determined in the presence of various bathing solutions. Erev averaged --5 m V in the standard modified Tyrode solution (Kass, Lederer, Tsien & Weingart, 1978). Erev was displaced toward more negative potentials when the external Na concentration (NaO) was reduced by replacement of NaCl with Tris Cl, choline Cl or sucrose. 3. A sudden reduction of NaO evoked a temporary increase in TI, followed after a few minutes by a sustained diminution. The initial increase was closely paralleled by an enhanced aftercontraction and could be explained by an indirect effect of NaO on internal Ca. The subsequent fall in TI amplitude could be accounted for by the reduced driving force, E--Erev. 4. Erev was not significantly changed by replacing extracellular Cl with methyl-sulphate, or by limited variations in external Ca (2.7--16.2 mM) or external K (1--8 MM). 5. These results are consistent with an increase in membrane permeability to Na and perhaps K. 6. TI was not directly affected by TTX, which blocks excitatory Na channels, or by Cs, which inhibits inwardly rectifying K channels. TI may be distinguished from the slow inward current by its kinetic, pharmacological and ionic properties. 7. TI might be carried by a pre-existing ionic pathway such as the 'leak' channel which provides inward current underlying normal pace-maker depolarization. Another possibility is that TI reflects Ca extrusion by an electrogenic Ca--Na exchange." @default.
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• W2004454757 date "1978-08-01" @default.
• W2004454757 modified "2023-09-26" @default.
• W2004454757 title "Ionic basis of transient inward current induced by strophanthidin in cardiac Purkinje fibres." @default.
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• W2004454757 doi "https://doi.org/10.1113/jphysiol.1978.sp012417" @default.
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