title: Engelmann and his laddergram.
abstract: Thomas Lewis is alliteratively credited with devising the laddergram. Engelmann, or perhaps Chauveau, truly deserves the honor. Mackenzie and Wenckebach popularized the schema in their books.
mesh_terms: D001145:Arrhythmias, Cardiac / Q000266:history; D004562:Electrocardiography / Q000266:history*; D005858:Germany; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans