Nikolai Korotkov

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Nikolai Sergeievich Korotkov (also Korotkoff) (February 13, 1874–1920) was a pioneer of 20th century vascular surgery and developed a technique for measuring blood pressure in 1905. He was physician-in-chief of the Metchnikov Hospital in Leningrad until his death in 1920.

Here is his report to the Imperial Military Academy in St. Petersburg in 1905:

The cuff of Riva-Rocci is placed on the middle third of the upper arm; the pressure within the cuff is quickly raised up to complete cessation of circulation below the cuff. Then, letting the mercury of the manometer fall one listens to the artery just below the cuff with a children's stethoscope. At first no sounds are heard. With the falling of the mercury in the manometer down to a certain height, the first short tones appear; their appearance indicates the passage of part of the pulse wave under the cuff. It follows that the manometric figure at which the first tone appears corresponds to the maximal pressure. With the further fall of the mercury in the manometer one hears the systolic compression murmurs, which pass again into tones (second). Finally, all sounds disappear. The time of the cessation of sounds indicates the free passage of the pulse wave; in other words at the moment of the disappearance of the sounds the minimal blood pressure within the artery predominates over the pressure in the cuff. It follows that the manometric figures at this time correspond to the minimal blood pressure.