Key result
Acute bradycardia elicits synchronized subcellular secondary Ca2+ releases that correlate with action potential duration prolongation and enhanced dispersion of repolarization, promoting afterdepolarizations.
Population
Langendorff-perfused hearts from female New Zealand White rabbits (60 to 120 days old)
Comparison
Pacing at a slow heart rate to induce… vs Pacing at a physiological baseline heart rate
Design
Preclinical
Authors
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Should not yet alter bradycardia management; hypothesis-generating in animal models and leaves open clinical translation.
Acute bradycardia elicits synchronized subcellular secondary Ca2+ releases that enhance dispersion of repolarization and promote afterdepolarizations, providing a mechanism for bradycardia-induced arrhythmias.
Kim et al. (2013) studied Bradycardia-induced arrhythmia (n=15). Bradycardia (Slow Heart Rate) vs. Baseline Heart Rate (120 beats/min) was evaluated on Action potential duration (APD) adaptation and secondary Ca2+ release. Acute bradycardia elicits synchronized subcellular secondary Ca2+ releases that correlate with action potential duration prolongation and enhanced dispersion of repolarization, promoting afterdepolarizations.
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