**4.4 Kindwall criteria of left bundle branch block (LBBB)**

[LBBB morphology] V1 or V2 with initial R > 30 ms = VT. [LBBB morphology] V1 or V2 QRS onset to nadir of S wave >60 ms = VT. [LBBB morphology] V1 or V2 with notching on the S wave downstroke = VT. [LBBB morphology] Any Q in V6 = VT [50–64, 69].
