VT Localizer VT Localizer Bundle pattern Select LBBB RBBB Frontal plane axis Select Inferior axis (II, III, aVF positive) Superior axis (II, III, aVF negative) Normal/intermediate axis (I and aVF positive) Northwest axis (I and aVF negative) Precordial transition Select Very early (V1-V2) Early (V2-V3) Mid (V3-V4) Late (V4-V6) Lead I Select Positive Negative Biphasic/isoelectric V1 pattern Select QS / predominantly negative rS Monophasic R qR rsR′ / RSR′ Inferior leads II, III, aVF Select Predominantly positive Predominantly negative Mixed aVR Select Positive Negative Initial R present aVL Select Positive Negative q wave present Structural heart disease Select Yes No Localize VT Reset
