The movements of the mammalian heart are so rapid and the performances of its various parts follow each other in such rapid succession that they call for delicate methods of registration and study. Many of our readers can easily recall the variety of recording apparatus that furnished the data in the early work of Chauveau and Marey, and in the investigations of many of their successors. Recording levers and tambours played a conspicuous part. Gradually they were made lighter and more delicate; yet such mechanical devices left much to be desired.
The introduction of electrocardiography has marked a decided step in advance. The real starting point was perhaps represented by the investigations of Burdon-Sanderson and Page in 1878 with the capillary electrometer on the tortoise heart. Waller in London initiated this mode of investigation on man a few years later; but, as Lewis1 remarks, it was in the present
THE HEART'S ACTIVITIES. JAMA. 1917;LXIX(21):1788. doi:10.1001/jama.1917.02590480042014
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