Work on this apparatus was commenced in 1909, when the desirability of a method for the continuous observation of human blood pressure was strongly borne in on my mind, as I investigated at the Charité in Berlin in association with Professor R. Staehelin the effect of muscle work on human blood pressure by means of the Uskoff sphygmotonometer. It became probable that this effect was, in general, a curve with a primary rise above and a secondary fall below the previous level; but we could not prove this: for, in spite of taking an observation every five minutes, one could not feel, certain that one had caught the maximum and the minimum of the effect.
The work of elaborating such an apparatus has since then been continued abortively until, in the summers of 1915 and 1916, Dr. Otis M. Cope, of the department of physiology of the University of Michigan,
FANTUS B. AN AUTOMATIC METHOD OF PROLONGED SERIAL BLOOD-PRESSURE REGISTRATION IN MAN. JAMA. 1917;LXVIII(24):1807–1810. doi:10.1001/jama.1917.04270060215007
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