animal experiments to support his theory that the sounds he had described were produced locally, rather than in the heart. He earned the approbation of professor M. V. Yanovsky, who declared: "Korotkov has noticed and intelligently utilised a phenomenon which many observers have overlooked." Yanovsky and his pupils verified the accuracy of the technique and described the phases of the auscultatory sounds and for a time technique was known as the Korotkov-Yanovsky method. Nikolai Korotkov, then serving as research physician to the mining district of Vitimsko-Olekminsky in Siberia, received his doctorate in 1910. After that he served as surgeon to the workers of the gold mines of Lensk. Here he witnessed Tsarist atrocities and was affected deeply by the murder of unarmed striking miners. After this Korotkov returned to St. Petersburg and during the First World War he was surgeon to "The Charitable House for disabled soldiers" in Tsarskoe Selo. He welcomed the October Revolution after which he was physician-in-chief of the Mechnikov Hospital in Petrograd until his death from lung tuberculosis on March 14, 1920. Associated eponyms Korotkoff method is a non-invasive auscultatory technique for determining both systolic and diastolic blood pressure levels. The method requires а sphygmomanometer and а stethoscope. Due to ease and accuracy, it is considered a "gold standard" for blood pressure measurement Korotkoff sounds are pulse-synchronous circulatory sounds heard through the stethoscope in auscultation of blood pressure using Riva-Rocci's sphygmomanometer. Korotkoff test or Korotkoff sign is a collateral circulation test: in aneurysm, if the blood pressure in the peripheral circulation remains fairly high while the artery above the aneurysm is compressed, the collateral circulation is good. Bibliography To the question of methods of determining the blood pressure (from the clinic of Professor S. P. Fedorov) [Russian]. Reports of the Imperial Military Academy 1905, 11: 365-367. Contribution to the methods of measuring blood pressure; second preliminary report 13 December 1905 [Russian]. Vrach Gaz 1906, 10: 278. Experiments for determining the efficiency of arterial collaterals. Stremennaia, 12 St Peterburg. P P Soykine's Press, 1910. (and Segall HN. Experiments for determining the efficiency of arterial collaterals by N C Korotkoff. Montreal: Mansfield Book Mart, 1980:265. - Preface biographical notes and editing of translation from Russian.) References Andrey K. Gurevich, M.D. "Journal Of Nephrology". Volume 19 no. Suppl. 10 - Special Issue on History of Nephrology. 2006 External links Whonamedit.com entry for N. Korotkov Inventors from the Russian Empire