na-agafe n'okpuru ma zaa ajụjụ ahụ mgbe e mesịrị n'otu asụsụ ahụ dị ka akụkụ ahụ: Nkọwa: Nghọta nke oge a nke usoro obi na-amalite na ọrụ nke dọkịta William Harvey (1578<unk>1657), bụ onye kọwara mgbasa ọbara na akwụkwọ ya "De motu cordis". Onye ụkọchukwu Bekee bụ Stephen Hales mere nyocha mbụ nke ọbara mgbali na 1733. Otú ọ dị, ọbara mgbali elu dị ka onye na-ahụ maka ahụike bịara n'onwe ya na nchọpụta nke sphygmomanometer nke Scipione Riva-Rocci na 1896. Nke a mere ka ọ dị mfe iji tụọ nrụgide systolic na ụlọ ọgwụ. N'afọ 1905, Nikolai Korotkoff meziwanye usoro ahụ site n'ịkọwa ụda Korotkoff nke a na-anụ mgbe a na-eji stethoscope na-eme ka akwara akwara mgbe a na-eme ka sphygmomanometer deflate. Nke a kwere ka a tụọ ọbara mgbali systolic na diastolic. Ajụjụ: N'afọ ahụ, Scipione Riva-Rocci mepụtara sphy
Afọ 1896