good cardiologist in bangalore Causes of Complete Heart Block: Age-related degeneration of the heart's conduction system Coronary artery disease or heart attacks (myocardial infarction) Heart surgery, especially around the AV node Congenital heart defects Infections, such as Lyme disease, endocarditis, or myocarditis Medication effects, such as beta-blockers, calcium channel blockers, or digoxin Autoimmune diseases, like systemic lupus erythematosus (SLE) or rheumatoid arthritis Electrolyte imbalances, such as hyperkalemia