Differentiating Wide-Complex Tachycardias

SVT With Aberrancy

• I, aVL: positive
• V1: triphasic
• Associated P waves

Ventricular Tachycardia

• I, aVL: negative
• V1: biphasic or positive
• aVR: positive
• Concordance in V1–V6 (all negative or all positive)
• Fusion or capture beats