Key result
Activation of β-adrenoreceptors in the superior vena cava myocardium induced a series of action potentials dependent on protein kinase A, highlighting its pro-arrhythmic potential.
Why the study?
Does β-adrenergic stimulation induce pro-arrhythmic activity in right superior vena cava myocardial tissue?
Does β-adrenergic stimulation induce pro-arrhythmic activity in right superior vena cava myocardial tissue?
β-adrenergic stimulation induces pro-arrhythmic electrical activity in superior vena cava myocardium via a protein kinase A-dependent mechanism, highlighting a potential source of atrial fibrillation.
Answers are grounded in this paper and cite their sources.
May implicate SVC as β-adrenergic trigger site in arrhythmias; leaves open clinical relevance pending human data.
Electrical activity of the right superior vena cava (SVC) is considered as a source of the atrial fibrillation. We have shown that bioelectrical properties of the SVC myocardium differ from those of the working atrial myocardium. Electrically evoked action potential duration in SVC is significantly shorter, the resting membrane potential in both stimulated and quiescent SVC preparations is significantly more positive than in atria. Activation of β-adrenoreceptors in SVC myocardium leads to a series of action potentials, and this process depends on protein kinase A. Probably, β-adrenergic stimulation enhances SVC arrhythmogenesis in vivo.
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Ivanova et al. (2017) studied Atrial fibrillation. β-adrenergic stimulation vs. Working atrial myocardium / unstimulated SVC was evaluated on Electrophysiological properties (action potential duration, resting membrane potential, pro-arrhythmic activity). Activation of β-adrenoreceptors in the superior vena cava myocardium induced a series of action potentials dependent on protein kinase A, highlighting its pro-arrhythmic potential.
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