Abstract
As to the measurement of blood pressure, various methods have been reported, either direct or indirect methods. However, the discovery of the fact by Korotkow that the minimum and the maximum pressures can be measured from the blood vassel tones originated at the pressure with manchette was a great achievement. Nevertheless, the method, which is most commonly in use even at the present time, contains various difficult points. By these reasons, long record the artery blood pressure wave indirectly from the radial artery by means of Piezo effect, while Roberts et al directly from the electromanometer.
The author recorded the blood pressure employing an electromanometer, which was recently devised by his Department and is possessing a superior frequency specificity. Comparing the result thus obtained with that obtained by Korotokow's stethoscopic method, the author found that the result obtained by the latter method is extremely inaccurate unless the pressure of manthette is lowered very slowly, and that the artery blood pressure wave accurately expresses the blood pressure even in the cases of thr stethoscopic gap or in the cases when the minimum blood pressure is measured as zero, which are often experienced in the stethoscopic method.
