ELECTROCARDIOGRAM !!!

In 1878, British physiologists John Burden Sanderson and Frederick Page, recorded the electrical current of a frog's heart's using a capillary electrometer. They showed two different phases of electrical current.


In 1887, British physiologist Augustus Waller of St. Mary's Medical School in London published the first human electrocardiogram - recorded by lab technician, Thomas Goswell. Augustus Waller was the first person to use the term electrocardiogram.

In 1891, British physiologists William Bayliss and Edward Starling of University College London improved the capillary electrometer used by Sanderson and Page. Bayliss and Starling connected the terminals to the right hand and to the skin over the apex beat and show a "triphasic variation accompanying (or rather preceding) each beat of the heart". They also demonstrate a delay of about 0.13 seconds between atrial stimulation and ventricular depolarization (later called PR interval).

In 1895, Willem Einthoven distinguished five different phases (deflections) of electrical current shown in a electrocardiogram, which he named P, Q, R, S and T.

In 1920, Harold Pardee of New York publishes the first electrocardiogram of an acute myocardial infarction in a human and describes the T wave as being tall and "starts from a point well up on the descent of the R wave.

In 1924, Willem Einthoven won the Nobel prize for inventing the electrocardiograph.