PR < .12 sec? YES -> Wolff-Parkinson-White
total QRS prolonged? YES -> quinidine or procainamide toxicity, severe hyperkalemia
initial QRS peaked in V1-V6? YES -> right bundle branch block (RBBB)
QRS wide overall in V1-V6? YES -> left bundle branch block (LBBB)
LBBB with axis < -45 degrees? YES -> left anterior hemiblock (LAHB)
LBBB with axis > 120 degrees? YES -> left posterior hemiblock (LPHB)