That makes the heart beat fast and irregularly, which can cause fainting or sudden death. His family was healthy, and his electrocardiogram and echocardiograms were normal. But an exercise stress test revealed he had ventricular arrhythmias during exercise. Doctors implanted a defibrillator in his heart to prevent fatal arrhythmias. Other patients had their arrhythmias controlled with atenolol, a beta-blocker.
Most diseases have more than one gene involved.
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