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Representative ECG traces from an 8 month old CASQ2Δ/Δ mouse undergoing provocation testing at baseline and after injection of labetalol. Sinus rhythm with multiple ventricular premature beats was recorded at rest, bidirectional VT after exercise and polymorphic VT after adrenaline. Labetalol evoked sinus bradycardia and eliminated the arrhythmia.
