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JAMA. 1915;LXIV(17):1380-1382. doi:10.1001/jama.1915.02570430012003.
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THE DETAILS OF THE PRESSURE CURVE IN THE LARGE ARTERIES  When the pressure within the large central arteries is recorded by mirror manometers capable of following exactly the detailed changes of pressure, the tracings (Fig. 1 A) manifest the following variations:A wave, a-b, associated with auricular systole and due either to a direct impact or pull of the auricle on the aorta or to a presystolic rise of tension in the ventricle.A preliminary oscillation, b-c, synchronous with the rise of intraventricular tension in early systole and probably due either to a bulging of the semilunar valves into the aorta or to a traction of the contracting ventricle on the aorta.The primary oscillation, c-d, synchronous with the first ejection of blood and due to the oscillation of the arterial blood column.The true systolic rise and summit, d-e, corresponding to the maximal pressure in the ventricle.The systolic


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