Key result
Dynamic-clamp-simulated ITO reduction prolonged action potential duration in human cells and increased cellular arrhythmic depolarisations from 0% to 64% in rabbit cells (P<0.05).
Population
Human and rabbit cardiac atrial myocytes isolated by enzymatic dissociation
Comparison
Dynamic-clamp-simulated transient outward K+… vs Baseline/control conditions without ITO…
Design
Preclinical
Authors
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ITO reduction may promote atrial afterdepolarizations under adrenergic stress; hypothesis-generating for AF mechanisms but requires human validation before any clinical consideration.
Absolute Event Rate: 64% vs 0%
p-value: p=< 0.05
Selective ITO reduction prolongs atrial action potential duration and promotes afterdepolarisations under beta-adrenergic stimulation, highlighting its role in atrial fibrillation mechanisms.
Workman et al. (2012) studied Atrial fibrillation mechanisms. Dynamic-clamp-simulated ITO reduction or block vs. Baseline (no ITO block) was evaluated on Incidence of cellular arrhythmic depolarisations (CADs) in the presence of isoproterenol (rabbit cells) (p=< 0.05). Dynamic-clamp-simulated ITO reduction prolonged action potential duration in human cells and increased cellular arrhythmic depolarisations from 0% to 64% in rabbit cells (P<0.05).
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