Electrocardiogram (lead II) and phonocardiogram simultaneously recorded from a patient with mitral stenosis by Thomas Lewis, mounted on card Electrocardiogram (lead II) and phonocardiogram
Electrocardiogram (lead II) with simultaneous venous and radial (arterial) polygraph tracings from a patient with first degree heart block, taken by Thomas Lewis and mounted on card, published 1925 Electrocardiogram (lead II) with simultaneous venous and radial (arterial) polygraph tracings 1925