Measurement of digital arterial blood pressure and its recording on usual electrocardiograph paper.

A simple method for measuring digital arterial pressure and its recording on usual EKG heat-writing paper was devised. The method enabled us to measure exactly the digital systolic as well as diastolic blood pressure without providing the calibrating scale of pressure, since the pressure scale is recorded on the paper automatically as pulse signals at the interval of 10mmHg. The pulse waves are also registered on the same paper by means of the finger plethysmograph. By use of a right-angled triangle transparent rule, we could estimate the value of digital systolic pressure at which the pulse wave began to appear when the cuff pressure for compressing the artery was gradually lowered. Estimated values of the digital arterial pressures were compared with those obtained by another method of Mendlowitz and his coworkers.