QRS > 0.12 in limb leads
Triphasic QRS (rSR') or biphasic (qR), often with ST depression & TWI in V1-V3
V1 must have a positive complex
Second R wave in V1 is always taller than the first (rSR')
Slurred S in 1 and V6
ST depression and TWI in other leads should arouse suspicion
Any ST elevation is abnormal in<unk>  and must prompt evaluation for STEMI
V1 must have a positive complex
Second R wave in V1 is always taller than the first (rSR')
Right bundle branch block
Assume any wide-complex tachycardia is ventricular tachycardia until proven otherwise 
Left bundle branch block
Regular
Third degree AV block
Monomorphic ventricular tachycardia
First degree AV block
PSVT with aberrant conduction: