ST Depression and T wave inversion are common
QRS > 0.12 in limb leads
Leads
Large and wide R waves — leads I, aVL, V5, and V6
Small R wave followed by deep S wave —leads II, III, aVF, V1–V3
Large and wide R waves — leads I, aVL, V5, and V6
Small R wave followed by deep S wave —leads II, III, aVF, V1–V3
Left bundle branch block
Assume any wide-complex tachycardia is ventricular tachycardia until proven otherwise 
Right bundle branch block
Regular
Third degree AV block
Monomorphic ventricular tachycardia
First degree AV block
PSVT with aberrant conduction: