Recommendations: diagnostic criteria with initial evaluation
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aClass of recommendation.
bLevel of evidence.
AV = atrioventricular; BBB = bundle branch block; ECG = electrocardiogram; ICD = implantable cardioverter defibrillator; OH = orthostatic hypotension; SVT = supraventricular tachycardia; VVS = vasovagal syncope; VT = ventricular tachycardia.