Cardiography comprehends the art and science of the instrumental registry of the movements and phases of the heart's revolution. Or, the term may designate either the art of producing, or the science resulting from, such graphic representations. The instrument which writes the changes is properly termed the cardiograph, and the graphic line produced by it, the cardiogram. Cardiography is less known and practiced than sphygmography, nevertheless its history is not unworthy of attention.
The first successful auto-records of the living heart were obtained in 1860 by Chauveau and Marey in their brilliant series of experiments on the horse. These experiments have become classical and their technique need not be detailed here. Suffice it to state that the variations of the blood-pressure in the cavities of the heart and in the aorta, as also the impressions of the heart against the chest-wall were faithfully and simultaneously recorded during the heart's revolutions.
KEYT AT. CARDIOGRAPHY. JAMA. 1885;V(6):141–145. doi:10.1001/jama.1885.02391050001001
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