指尖光電脈波に関する生理學的研究

抄録

The clinical use of plethysmography has been evaluated by numerous workers as a good indicator of the conditions not of vascular system but of sympathetic nervous system, which innervates peripheral blood vessels. Only few physiological studies, however, have been reported up to the present.
The purpose of the present paper is to detect more delicate features of plethysmogram, to reveal physiogical factors swhcch control its mechanism, to consider these things in comparison with other sympathetic phenomenon and to discuss characters of plethysmogramh to be used.
Ten normal adults, aged from 19 to 36, were the subjects.
Photoelectric plethysmogramh and direct amplifier connected with inkwriting recorder were used.
Pulse wave were recorded from the small finger tip of right hand, and respiration, ECG and GSR were recorded simultaneously.
1) At rest, saw-toothed plethysmogram with slightly changed duration and amplitude by respiration was observed.
2) By stimulation, deflection of the bass line, shortened amplitude of the pulse ware and shortened duration of pulse wave were observed.
3) By blocking of the sympathetic nerves to the finger, enlarged amplitude of pulse wave was observed and the former two responses were eliminated, while the latter remained.
4) By applying heat to hand, enlarged amplitude of pulse wave was observed and two former responses became evident. Applying coldness resulted smaller amplitude of pulse wave and equivocal two former responses, while the latter was indifferent by changes of temperature.
5) Plethysmography is irritable to the controlling blood supply, while GSR is sensitive by the changes of temperature.
6) Direct amplifier is desirable in order to observe deflection of the base line and C-Ramplifier permits qualitative observation of pulse wave.