Etiologies of Atrioventricular Block | |
| Autonomic | |
| Carotid sinus hypersensitivity | Vasovagal |
| Metabolic/Endocrine | |
| Hyperkalemia | Hypothyroidism |
| Hypermagnesemia | Adrenal insufficiency |
| Drug-Related | |
| Beta blockers | Adenosine |
| Calcium channel blockers | Antiarrhythmics (class I and III) |
| Digitalis | Lithium |
| Infectious | |
| Endocarditis | Tuberculosis |
| Lyme disease | Diphtheria |
| Chagas' disease | Toxoplasmosis |
| Syphilis | |
| Heritable/Congenital | |
| Congenital heart disease | Kearns-Sayre syndrome |
| Maternal SLE | Myotonic dystrophy and other muscular dystrophies |
| Inflammatory | |
| SLE | MCTD |
| Rheumatoid arthritis | Scleroderma |
| Infiltrative | |
| Amyloidosis | Hemochromatosis |
| Sarcoidosis | |
| Neoplastic/Traumatic | |
| Lymphoma | Radiation |
| Mesothelioma | Catheter ablation |
| Melanoma | |
| Degenerative | |
| Lev's disease | Lenègre's disease |
| Coronary Artery Disease | |
| Acute MI | |
Abbreviations: MCTD, mixed connective tissue disease; MI, myocardial infarction.