**4.3 Griffith criteria**

A history of myocardial infarction, QRS morphology in leads aVF and V1 ([1] predominant negative deflection in aVF in tachycardia with RBBB pattern and Q wave, [2] a monophasic or biphasic waveform in V1 in tachycardia with RBBB pattern, [3] QS or qR waveform in tachycardia with LBBB pattern favored a diagnosis of VT) and frontal plane axis > 40° when compared with baseline the ECG favored a diagnosis of VT. The presence of AV dissociation and/or the presence of premature ventricular beats during sinus rhythm that show morphologies same to that observed in tachycardia favored a diagnosis of VT [50–64, 66–68].
