Key result
In a rabbit model, chronic kidney disease increased right ventricular outflow tract arrhythmogenesis, characterized by a higher incidence of tachypacing-induced ventricular tachycardia driven by calcium dysregulation.
Why the study?
CKD increases arrhythmia risk, and the RVOT is a key site of VT origination, leading investigators to hypothesize that CKD promotes RVOT arrhythmogenesis via calcium dysregulation.
Answers are grounded in this paper and cite their sources.
In a rabbit model, chronic kidney disease increases right ventricular outflow tract arrhythmogenesis and ventricular tachycardia susceptibility through calcium dysregulation, oxidative stress, and autonomic hyperactivity.
Chronic kidney disease (CKD) increases the risk of arrhythmia. The right ventricular outflow tract (RVOT) is a crucial site of ventricular tachycardia (VT) origination. We hypothesize that CKD increases RVOT arrhythmogenesis through its effects on calcium dysregulation. We analysed measurements obtained using conventional microelectrodes, patch clamp, confocal microscopy, western blotting, immunohistochemical examination and lipid peroxidation for both control and CKD (induced by 150 mg/kg neomycin and 500 mg/kg cefazolin daily) rabbit RVOT tissues or cardiomyocytes. The RVOT of CKD rabbits exhibited a short action potential duration, high incidence of tachypacing (20 Hz)‐induced sustained VT, and long duration of isoproterenol and tachypacing‐induced sustained and non‐sustained VT. Tachypacing‐induced sustained and non‐sustained VT in isoproterenol‐treated CKD RVOT tissues were attenuated by KB‐R7943 and partially inhibited by KN93 and H89. The CKD RVOT myocytes had high levels of phosphorylated CaMKII and PKA, and an increased expression of tyrosine hydroxylase‐positive neural density. The CKD RVOT myocytes exhibited large levels of I to , I Kr , NCX and L‐type calcium currents, calcium leak and malondialdehyde but low sodium current, SERCA2a activity and SR calcium content. The RVOT in CKD with oxidative stress and autonomic neuron hyperactivity exhibited calcium handling abnormalities, which contributed to the induction of VT.
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Huang et al. (2021) studied Chronic kidney disease and ventricular arrhythmia (n=80). Chronic kidney disease (induced by neomycin and cefazolin) vs. Control (healthy rabbits) was evaluated on Incidence of tachypacing-induced ventricular tachycardia in right ventricular outflow tract tissues (p=<0.05). In a rabbit model, chronic kidney disease increased right ventricular outflow tract arrhythmogenesis, characterized by a higher incidence of tachypacing-induced ventricular tachycardia driven by calcium dysregulation.
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