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William Birnbaum with a Phonocardiogram System for use in Project Gemini, 1965. Awareness of the sounds made by the heart dates to ancient times. The idea of developing an instrument to record it may date back to Robert Hooke (1635–1703), who wrote: "There may also be a possibility of discovering the internal motions and actions of bodies - whether animal, vegetable, or mineral, by the sound ...
A Wiggers diagram, named after its developer, Carl Wiggers, is a unique diagram that has been used in teaching cardiac physiology for more than a century. [1] [2] In the Wiggers diagram, the X-axis is used to plot time subdivided into the cardiac phases, while the Y-axis typically contains the following on a single grid: Blood pressure. Aortic ...
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[2] [3] The major way health care providers examine the heart on physical exam is heart auscultation; [3] another clinical technique is palpation, which can detect by touch when such turbulence causes the vibrations called cardiac thrill. [4] A murmur is a sign found during the cardiac exam. Murmurs are of various types and are important in the ...
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