What is the clinical evidence from this study?

Study design: Other. Population: Hypokalemia. Intervention: Simulated hypokalemia vs. Normal [K+]o (4.0 to 5.4 mM). Primary outcome: Resting potential (Vr) and action potential (AP) waveform.

May 26, 2021Frontiers in PhysiologyOpen Access

Immediate and Delayed Response of Simulated Human Atrial Myocytes to Clinically-Relevant Hypokalemia

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Key result

Simulated hypokalemia depolarizes human atrial myocytes via immediate IK1 changes and delayed Na+/K+ pump alterations.

Why the study?

Small transient electrolyte changes alter cardiac physiological responses, and the electrophysiological mechanisms underlying changes in resting potential and action potential during clinically relevant hypokalemia were explored.

Does simulated clinically-relevant hypokalemia alter resting potential and action potential repolarization in mathematical models of human atrial myocytes?

Population

Seven published models of the human atrial action potential

Comparison

Hypokalemia (~1.5 mM reduction) vs normal plasma K+ (4 to 4.5 mM)

Design

Mathematical modeling and simulation study

Authors

MCMichael ClerxUniversity of Nottingham GMGary R. MiramsUniversity of Nottingham ARAlbert J. RogersCardiovascular Institute of the South

Discussion

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Implication

Hypokalemia may heighten atrial arrhythmia risk; hypothesis-generating for validation in patients and targeted therapies.

Structured PICO

Does simulated clinically-relevant hypokalemia alter resting potential and action potential repolarization in mathematical models of human atrial myocytes?

Population

Seven published mathematical models of the human atrial action potential

Intervention

Simulated clinically-relevant hypokalemia (reduction of extracellular K+ by approximately 1.5 mM from normal 4-4.5 mM)

Comparator

Normal extracellular K+ (4 to 4.5 mM)

Outcome

Electrophysiological responses including changes in resting potential (Vr) and action potential (AP) repolarizationsurrogate

Computational modeling demonstrates that clinically relevant hypokalemia promotes atrial proarrhythmic substrates through both immediate IK1-mediated and delayed Na+/K+ pump-mediated electrophysiological changes.

Limitations

Intracellular K+ ([K+]i) is a fixed parameter in most human atrial action potential models.
None of the computational models have been formulated or validated using data obtained at low or normal [K+]o.
Predictions for low plasma electrolyte levels from published models vary qualitatively and quantitatively.

Cite This Study

Clerx et al. (2021) studied Hypokalemia. Simulated hypokalemia vs. Normal [K+]o (4.0 to 5.4 mM) was evaluated on Resting potential (Vr) and action potential (AP) waveform. Simulated clinically-relevant hypokalemia in human atrial myocytes caused immediate depolarization of the resting potential due to IK1 rectification changes, followed by delayed effects from altered Na+/K+ pump activity.

synapsesocial.com/papers/6a1746d80256ba8a087866b7 https://doi.org/10.3389/fphys.2021.651162

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Immediate and Delayed Response of Simulated Human Atrial Myocytes to Clinically-Relevant Hypokalemia

Discussion

Member takes

Implication

Structured PICO

Limitations

Cite This Study

Immediate and Delayed Response of Simulated Human Atrial Myocytes to Clinically-Relevant Hypokalemia

Discussion

Member takes

Implication

Structured PICO

Limitations

Cite This Study

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