First degree AV block, right bundle branch block, and left anterior hemiblock
Conduction disease of all three fascicles: fight bundle branch, and left posterior and left anterior fascicles<unk> s can deteriorate into high grade blocks
Trifascicular Block
Differential includes ischemic events, electrolyte abnormalities, and medication overdoses in addition to rheumatologic conditions[1][2]
Digital block
Anterior MI
Cervical spine clearance
Rheumatic fever
Nerve and regional blocks 
Myocarditis