On the interpretation of cardiographic tracings, and the evidence which they afford as to the causation of the murmurs attendant upon mitral stenosis.

"The first case of heart block in a human documented graphically was reported in 1875 by British physician Alfred Galabin. He published an apical pulse tracing from a 34-year-old man with a two-year history of lightheaded spells associated with bradycardia. The tracing is consistent with complete atrioventricular dissociation with a normal atrial rate and a ventricular rate of 25 to 30 beats per minute" (W. B. Fye, "Disorders of the Heartbeat,: Am. J. Cardiol.,1993).

Digital facsimile from Google Books at this link.