​Differential diagnosis of causes of atrioventricular block ( first, second and third degree of heart block)

​Differential diagnosis of causes of atrioventricular block ( first, second and third degree of heart block) 
-Chagas’ disease
-increased vagal tone ( first degree or Mobitz type I)
-amyloidosis 
-hemochromatosis 
-sarcoidosis 
-myocardial infarction 
-myocardial ischemia 
-Lev’s disease
-age related conduction system fibrosis or calcification
-Lev’s disease
-drugs such as anti arrhythmic, amiodarone, clonidine, beta blockers, calcium channel blockers, digitalis