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Blood Pressure

In 1905, Korotkoff, a medical officer, detected the typical, low sound with which the blood swirls through the arteries, and soon the well-known method using cuff and stethoscope was developed which the doctors apply even today to determine the blood pressure: 140 to 90 mmHg is the limiting value from which high blood pressure is diagnosed and the patient is urgently advised to lead a more healthy life. Although the method seems to be simple and does not cause any inconvenience to the patient – the values found allow statements to be made on a complex interplay inside the human body, which can be referred to for comparison purposes. The cardiac muscle pumps the blood into the arteries which offer a certain resistance to the blood flow. This resistance ensures that the blood does not obey the laws of gravitation and simply sinks down, but that is finds its way also to the brain.

© Physikalisch-Technische Bundesanstalt, last update: 2011-11-17, Volker Großmann Seite drucken PrintviewPDF-Export PDF