Korotkov sounds are the sounds that medical personnel listen for when they are taking blood pressure using a non-invasive procedure.
They are named after Dr. Nikolai Korotkov, a Russian physician who discovered them in 1905, when he was working at the Imperial Medical Academy in St. Petersburg, the Russian Empire. Wikipedia
Korotkov sounds by KOROTKOV
Korotkov (Korotkoff) sounds (or K-Sounds) are the “tapping” sounds heard with a stethoscope as the cuff is gradually deflated. Traditionally, these sounds have been classified into five different phases (K-1, K-2, K-3, K-4, K-5) and are shown in the figure below.
Korotkoff sounds are blood flow sounds that healthcare providers observe while taking blood pressure with a sphygmomanometer over the brachial artery in the antecubital fossa. These sounds appear and disappear as the blood pressure cuff is inflated and deflated.