A 12-lead Electrocardiography (ECG)  is the gold standard test for the diagnosis of third degree<unk>  block. Nevertheless, it might be normal in patients with transient<unk>  block. A Holter monitoring and/or telemetry must be performed when the patient presents with signs and symptoms which raising concern for complete heart block in the presence of a normal ECG. Diagnostic electrophysiologic studies might be used in certain complicated cases
Third degree AV block diagnostic study of choice
Second degree AV block diagnostic study of choice
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Ventricular tachycardia diagnostic study of choice
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Second degree AV block other diagnostic studies
Third degree AV block other diagnostic studies