Historical evaluation of concepts concerning A-V conduction.
D006327:Heart Block / Q000266:history*; D006329:Heart Conduction System; D049669:History, 16th Century; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D010701:Phonocardiography