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• W1965223903 abstract "Catecholaminergic polymorphic ventricular tachycardia (CPVT) is an inherited arrhythmia syndrome characterized by VT induced by adrenergic stress in the absence of structural heart disease and high incidence of sudden cardiac death. The diagnosis is made based on reproducible ventricular tachyarrhythmias including bidirectional VT and polymorphic VT during exercise testings. Two causative genes of CPVT have been identified: RYR2, encoding the cardiac ryanodine receptor (RyR2) Ca(2+) release channel, and CASQ2, encoding cardiac calsequestrin. A mutation in RYR2 or CASQ2 is identified in approximately 60% of patients with CPVT. Mutations in these two genes destabilize the RyR2 Ca(2+) release channel complex in sarcoplasmic reticulum and result in spontaneous Ca(2+) release through RyR2 channels leading to delayed after depolarization, triggered activity, and bidirectional/polymorphic VT. Implantable cardioverter defibrillators (ICDs) are recommended for prevention of sudden death in patients with CPVT.1. A.E. Epstein, J.P. DiMarco, K.A. Ellenbogen, et al., ACC/AHA/HRS 2008 Guidelines for Device-Based Therapy of Cardiac Rhythm Abnormalities: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines (Writing Committee to Revise the ACC/AHA/NASPE 2002 Guideline Update for Implantation of Cardiac Pacemakers and Antiarrhythmia Devices): developed in collaboration with the American Association for Thoracic Surgery and Society of Thoracic Surgeons. Circulation. 2008;117:e350 However, painful shocks can trigger further adrenergic stress and arrhythmias, and deaths have occurred despite appropriate ICD shocks. Treatment with β-adrenergic blockers reduces arrhythmia burden and mortality, but is not completely effective. The beneficial effects of Ca(2+) channel blocker verapamil in combination with β-blocker have been reported, but the role of verapamil has not been well assessed. Because Ca(2+) leakage through ryanodine channel is a common mechanism of CPVT, ryanodine channel block may have a therapeutic effect. We discovered that flecainide directly inhibits RyR2 channels and prevent CPVT. Left cardiac sympathetic denervation may be an effective alternative treatment in combination with ICD, especially for patients whose arrhythmias are not controlled by drug therapies." @default.
• W1965223903 created "2016-06-24" @default.
• W1965223903 creator A5064477997 @default.
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• W1965223903 date "2011-11-01" @default.
• W1965223903 modified "2023-10-02" @default.
• W1965223903 title "Mechanism underlying catecholaminergic polymorphic ventricular tachycardia and approaches to therapy" @default.
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• W1965223903 doi "https://doi.org/10.1016/j.jelectrocard.2011.07.025" @default.
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