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• W2056741592 abstract "The familial condition catecholaminergic polymorphic ventricular tachycardia (CPVT) is characterized by episodic bidirectional ventricular tachycardia (BVT), polymorphic ventricular tachycardia (PVT), and ventricular fibrillation following adrenergic challenge. It is associated with mutations involving the cardiac ryanodine receptor (RyR2).We explored for a slowing of myocardial conduction that could potentially result in a substrate for the spontaneous arrhythmogenesis that was observed following introduction of isoproterenol and caffeine in intrinsically beating murine RyR2-P2328S hearts. Such pharmacological challenge increased the number of arrhythmic episodes in electrocardiographic recordings from intact anesthetized mice, with the greatest effects in the homozygote RyR2(S/S). Arrhythmias took the form of bigeminy, BVT, monomorphic ventricular tachycardia, and PVT, as found in human CPVT. Ventricular epicardial conduction velocities (CVs) measured using multielectrode array recordings and maximum action potential upstroke rates, (dV/dt)(max), measured using intracellular microelectrodes were indistinguishable in untreated wild-type (WT) and RyR2(S/S). Pharmacological challenge of RyR2(S/S), but not WT hearts, then reduced CV and (dV/dt)(max) and also revealed a strongly arrhythmic phenotype. There was no evidence of gross structural or fibrotic changes in either RyR2(+/S) or RyR2(S/S) hearts on light microscopy.We associate altered ventricular myocardial CV potentially resulting in arrhythmogenic substrate with arrhythmic properties associated with genetic RyR2 alterations for the first time." @default.
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• W2056741592 date "2012-11-06" @default.
• W2056741592 modified "2023-10-05" @default.
• W2056741592 title "Conduction Slowing Contributes to Spontaneous Ventricular Arrhythmias in Intrinsically Active Murine<i>RyR2-P2328S</i>Hearts" @default.
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• W2056741592 doi "https://doi.org/10.1111/jce.12015" @default.
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