What is the clinical evidence from this study?

Intervention: Ouabain, dinitrophenol (DNP), and lithium-substituted Tyrode's solution. Primary outcome: Pacemaker current (IK2) and oscillatory inward current (IOS).

What question did this study set out to answer?

This research aims to understand how ouabain and other inhibitors affect the pacemaker current in sheep cardiac Purkinje fibers.

May 1, 1977Circulation ResearchOpen Access

The effect of ouabain, dinitrophenol, and lithium on the pacemaker current in sheep cardiac Purkinje fibers.

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Key result

Exposure to ouabain, dinitrophenol, or lithium decreased the pacemaker current (IK2) amplitude, and prolonged ouabain exposure replaced IK2 with an oscillatory inward current in sheep fibers.

Key Points

This research aims to understand how ouabain and other inhibitors affect the pacemaker current in sheep cardiac Purkinje fibers.
Investigated the effects of ouabain, dinitrophenol, and lithium on the pacemaker current (IK2) in sheep cardiac Purkinje fibers
Measured changes after prolonged exposure to ouabain
Assess effects on current thresholds and amplitudes.
Ouabain exposure (2 x 10^(-7) M) decreased the amplitude of the IK2 activation curve
Dinitrophenol and lithium also produced a similar decrease in IK2
Prolonged exposure to ouabain resulted in an oscillatory inward current (IOS) with threshold -50 to -60 mV.

Structured PICO

Population

Sheep cardiac Purkinje fibers

Intervention

Exposure to ouabain (2 X 10(7) M), dinitrophenol (DNP), or lithium-substituted Tyrode's solution

Outcome

Effect on the pacemaker current (IK2) and appearance of oscillatory inward current (IOS)surrogate

Discussion

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Implication

Inhibition of the Na-K pump by ouabain in sheep Purkinje fibers decreases the pacemaker current IK2 and induces an arrhythmogenic oscillatory inward current (IOS).

Cite This Study

Aronson et al. (1977) studied this question. Ouabain, dinitrophenol (DNP), and lithium-substituted Tyrode's solution was evaluated on Pacemaker current (IK2) and oscillatory inward current (IOS). Exposure to ouabain, dinitrophenol, or lithium decreased the pacemaker current (IK2) amplitude, and prolonged ouabain exposure replaced IK2 with an oscillatory inward current in sheep fibers.

synapsesocial.com/papers/6a45acf56f4bbfd563da309a https://doi.org/10.1161/01.res.40.5.517

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Implication

Inhibition of the Na-K pump by ouabain in sheep Purkinje fibers decreases the pacemaker current IK2 and induces an arrhythmogenic oscillatory inward current (IOS).

The effect of ouabain, dinitrophenol, and lithium on the pacemaker current in sheep cardiac Purkinje fibers.

Key Points

Structured PICO

Discussion

Implication

Cite This Study

The effect of ouabain, dinitrophenol, and lithium on the pacemaker current in sheep cardiac Purkinje fibers.

Key Points

Structured PICO

Discussion

Implication

Cite This Study

Also Consider

Also Consider