Investigations include:
Echocardiogram - this is required if there are unexplained arrhythmias in a patient who is under 50 years of age. Note that lesions such as mitral stenosis and hypertrophic obstructive myopathy may cause atrial fibrillation and ventricular arrhythmias respectively.
Cardiac catheterization - once documented, the origin of a ventricular arrhythmia may be demonstrated by insertion of multiple leads into the heart. Arrhythmias may then be stimulated and various drugs tested to see their effect on the generated arrhythmia.
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