Complete heart block is occasioned by interruption the pathway of atria-ventricular conditions in the A-V node, and bundle branches. Complete heart block was considered to be due to ischaemic heart disease. Many other causes of heart block are given as inflammatory lesions, rheumatic fever, diphtheritic and viral myocarditis, primary myocardial diseases etc. Complete heart block in children is given as congenital in or in. Drugs which occasionally cause complete heart block have also been enumerated. Most of the cases of complete A-V block are due to bilateral bundle branch fibros without involving the A-V node or bundle of His. Idic pathic block is attributed to sclerosis of the left side of cardiac skeleton which is an ageing phenomena beginning at the age of 40 years. Most of the cases complete A-V block are of obscure aetiology. Views of other workers based on their experiments and studies have been quoted.