2017 guidelines from the AHA/ACC/HRS state that MRI, cardiac computed tomography (CT), or radionuclide angiography can be useful in detecting and characterizing underlying heart disease when echocardiography fails to provide an accurate evaluation of LV or RV function and/or assessment of structural changes. Electrophysiologic (EP) testing can be useful when an uncertain diagnosis of sustained monomorphic ventricular tachycardia. An electrophysiological study is especially useful for assessing the risk of ventricular tachycardia in patients with ischemic cardiomyopathy, non-ischemic cardiomyopathy, or adult congenital heart disease who have syncope or other ventricular arrhythmia symptoms and who do not meet indications for a primary prevention implantable cardioverter-defibrillator.
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