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This research aims to investigate how ouabain affects intracellular potassium levels and membrane potentials in canine cardiac Purkinje fibers.

March 1, 1978Circulation ResearchOpen Access

The effects of ouabain on the transmembrane potentials and intracellular potassium activity of canine cardiac Purkinje fibers.

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Experimental study reveals ouabain's impact on potassium activity in canine cardiac cells, indicating ion gradient changes.

This research aims to investigate how ouabain affects intracellular potassium levels and membrane potentials in canine cardiac Purkinje fibers.
Utilized open-tip microelectrodes with a potassium-sensitive liquid ion exchanger.
Superfused fibers with ouabain and potassium for 30 minutes.
Measured changes in intracellular potassium activity and resting membrane potential.
Intracellular potassium activity decreased from 130.0 mM to 112.2 mM.
Resting membrane potential decreased from -83.6 mV to -78.8 mV.
Findings suggest an accumulation of potassium at the cell membrane's exterior.

Miura et al. (1978) studied this question.

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