<prompt> Answer this question truthfullyWhat does a premature ventricular contraction electrocardiogram represent?  <response>: <reason> Class I 1. In patients with VA symptoms associated with exertion, suspected ischemic heart disease, or catecholaminergic polymorphic ventricular tachycardia, exercise treadmill testing is useful to assess for exercise-induced VA Level of Evidence: B-NR. 2. In patients with suspected or documented VA, a 12-lead ECG should be obtained in sinus rhythm to look for evidence of heart disease Level of Evidence: B-NR. Class I 1. Ambulatory electrocardiographic monitoring is useful to evaluate whether symptoms, including palpitations, presyncope, or syncope, are caused by VA Level of Evidence: B-NR. Class IIa 1. In patients with sporadic symptoms including syncope suspected to be related to VA, implanted cardiac monitors can be useful Level of Evidence: B-R. 