N'afọ 1905, Nikolai Korotkoff mere ka usoro ahụ dịkwuo mma site n'ịkọwa ụda Korotkoff nke a na-anụ mgbe a na-eji stethoscope na-eme ka akwara dị arọ mgbe a na-eme ka sphygmomanometer deflated. Nke a kwere ka a tụọ ọbara mgbali systolic na diastolic. Ajụjụ: Gịnị ka akwụkwọ William Harvey dere?
De motu cordis