Abstract
SummaryCarotid compression was applied to 84 cases and EEG record thereof was taken. At the same time, the changes of the instantaenous values and integrated values were traced with the use of 2‐channel simultaneous automatic frequency analyser. In addition, a polygraphic observation was made by means of plethy‐smogram, cardiogram, cardio‐tachogram, pneumatogram, electro‐myogram, and eye‐ball movement. Of 84 cases, 53 had clinically diagnosed to have cerebral circulatory disorders, 21 without it, and as to the other 11 cases, no diagnostic determination was possible. Further, there was normal control group consisted of 10 persons.Under the carotid compression test, in the EEG of 21 out of 53 cases with cerebral circulatory disturbance, the slow waves of 1.5–5 c/s and 50–100 μV appeared, while no such phenomenon was observable in the group without the said abnormality. The result of EEG‐analysis shows that during the appearance of the slow waves, α‐band diminished and both θ‐and δ‐bands extended. Variance was seen between the normal control group and the group with the disturbance with reference to the transition of these three bands. In general, the blood pressure was lowered and the pulsation slowed down. Upon the cessation of the pressure application, all recovered the normal state.
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