Korotkov noise

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Principle of auscultatory blood pressure measurement based on Korotkow sounds
Blood pressure monitor designed by Nikolai Sergejewitsch Korotkow

A Korotkow sound (after Nikolai Sergejewitsch Korotkow ) is understood to be the sound that can be heard (auscultated) when measuring blood pressure with a stethoscope . When the blood pressure cuff is inflated, the artery is squeezed. The pulse-synchronous noises that can be heard when the pressure is slowly released in the cuff are called Korotkow noises. These are swirling noises during turbulent blood flow that can only be heard when the artery is partially compressed. When they occur (time A in the illustration), blood can flow through the vessel again in the systole of the heart, but not yet in the diastole . When it disappears (time B in the figure) when the pressure is released further, there is no longer any compression on the vessel; the blood then flows through the vessel without turbulence ( laminar ) and therefore noiselessly.

The pressure at which the noise occurs corresponds to the systolic (upper) blood pressure value, and that at which it disappears is the diastolic (lower) value.

Nikolai Sergejewitsch Korotkow, a Russian military doctor, improved the Riva-Rocci method in 1905 by using the stethoscope to auscultate Korotkow sounds . In contrast to this, the diastolic blood pressure could now also be estimated. Korotkow also subdivided the noises to be heard so that, strictly speaking, five different Korotkow noises can be distinguished.

Individual evidence

  1. ↑ YL Shevchenko, JE Tsitlik: 90th Anniversary of the development by Nikolai S. Korotkoff of the auscultatory method of measuring blood pressure. In: Circulation . 1996, 94: pp. 116-118. PMID 8674166 .
  2. ↑ AV Nabokov, AJ Nevorotin: Dr NS Korotkov: the low-pitch sounds did was high. In: Nephrology Dialysis Transplantation . 1998, 13: pp. 1041-1043. PMID 9568882 .
  3. ↑ D. Paskalev, A. Kircheva, S. Krivoshiev: A centenary of auscultatory blood pressure measurement: a tribute to Nikolai Korotkoff. In: Kidney & blood pressure research. Volume 28, Number 4, 2005, pp. 259-263, ISSN  1420-4096 . doi : 10.1159 / 000090084 . PMID 16340219 .