In a previous paper read at the 21st Ishikawa-Toyama Regional Meeting of the Japan Society for Internal Medicine, October 28, 1956 and the Sixth Meeting of the Japan Society for Acupuncture and Moxibustion Therapy, October 10, 1956 the author described an instrument which he called the electroscillopulsimeter. Its pick-up part is shown in the accompanying figure.
By recording the pulse waves of the radial artery with this instrument the author obtained several new findings which could not be obtained with conventional pulse wave meters and blood pressure meters.In the present paper a basic study of pulse waves and blood pressure will be reported.
In recording pulse waves it is impossible to eliminate the irregularities caused by respiration. This makes it very difficult to objectivize pulse diagnosis. The amplitude of the pulse waves is larger during inspiration and smaller during expiration. Respiration also causes similar irregularity of the heart sound.
If the pressure of the electroscillopulsimeter is first increased till the pulse can no longer be felt and then gradually reduced while the pulse waves are traced by it the arterial sound heard through the electrostethoscope shows the following peculiarity. At first each pulse wave is accompanied by one sound, and when the pressure is reduced each wave is accompnied by two sounds and then bythree. If the pressure is still lowered the number of sounds accompanying each wave becomes again two and then one and finally the sound becomes inaudible. The portion where two sounds accompany each wave corresponds to the “chin” and “fu” pulse and that with three sounds corresponds to “chu” pulse. This last portion can be divided into two parts, the pitch being higher in the first half and lower in the second. The author thinks that these correspond to Swan's second and third periods. Simultaneous tracing with the pulsimeter and the electrocardiograph shows that first of the triplet agrees in time with the contraction of the ventricles and the last with the back-stroke elevation.
The occurrence of this phenomenon about the pulse sound confirms thecorrectness with which the pick-up part of the instruments is being applied to the pulse-taking point.
Raising of arms will make the pulse wave smaller and lowering of them, larger. If the elbow joint is bent to45 the waves become larger than when the arm is extended. If, with the elbow bent as before the wrist joint is lightly bent congestion or backward flow of the arterial blood occurs at the pulse-taking point, and the first spindle coinciding with “chin” pulse clearly shows itself. When the elbow is fully bent the amplitude of the pulse waves becomes very small.Contracting of the biceps will not make the pulse stop if the elbow is held at the 45 angle, but will make it stop if the elbow is fully bent.
From the theoretical consideration explained in the author's previous papers and the experimental results mentioned above it is seen that the direction given below should be followed in learning the six-point pulse-taking technique.
The examiner should place his fingers exactly at right angles with the radial artery of the subject. The thumb should be on the back of the wrist, the middle finger at the “kan” position, that is, the location of the styloid process. The second and the fourth fingers are placed at the “sun” and the “shaku” position, respectively. With the three fingers at the “sun”“kan” and “shaku” positions they are pressed down so that the subject's “chu” pulse is felt. Then without changing the relative positions of the fingers the pressure is increased till the pulse stops, and then reduced a little to feel the “chin” pulse. Next the pressure is further reduced till the pulse is barely perceptible, to get the “fu” pulse.
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