Table 1.

Electrocardiographic criteria proposed for the identification of epicardial VTs.

Reference	Underlying heart disease	Limitations	Technique	ECG criteria
Berruezo et al. [12]	CAD 72% IDCM 28%	RBBB VT	Pace mapping and clinical VT	Pseudodelta wave ≥34 ms Intrinsicoid deflection V2 ≥85 ms Shortest RS complex ≥121 ms
Daniels et al. [22]	No SHD	Described for LVOT VT	Clinical VT	Precordial maximum deflection index ≥0.55
Bazan et al. [52] VallÈs et al. [53]	NICM	Absence of Q wave in sinus rhythm	Pace mapping and clinical VT	Q wave in lead I for anterolateral epi VT Q wave in inferior lead for inferior epi VT
Bazan et al. [66]	CAD: 2, IDCM: 4, ARVC: 2, No SHD: 5	No tested in ARVC VTs. Absence of Q wave in sinus rhythm	Pace mapping in RV	Q wave in lead I / QS in lead V2 for anterior epi RV VT Q wave in leads II, III, and aVF is inferior epi RV VT

ARVC, Arrhythmogenic right ventricular cardiomyopathy; CAD, Coronary artery disease; IDCM, Idiopathic dilated cardiomyopathy; SHD, Structural heart disease; VT: ventricular tachycardia.