Name six causes of complete heart block

  1. Chronic degenerative changes (sclerosis or fibrosis) of the conduction system NOT related to MI - a common cause seen particularly in older patients
  2. Digitalis intoxication
  3. Lyme disease
  4. Open heart surgery, particularly after aortic valve replacement
  5. Bacterial endocarditis
  6. MI

Source

Goldberger: Clinical Electrocardiography: A Simplified Approach, 7th ed.